Vb

What is the difference between char and varchar data types?The char is a fixed-length character data type, the varchar is a variable-length character data type.Because char is a fixed-length data type, the storage size of the char value is equal to the maximum size for this column. Because varchar is a variable-length data type, the storage size of the varchar value is the actual length of the data entered, not the maximum size for this column.You can use char when the data entries in a column are expected to be the same size.You can use varchar when the data entries in a column are expected to vary considerably in size.

Which controls can not be placed in MDI ?U can not place command button, Lable, drive box, Tree view etc.Controls without align property can not be placed directly on MDI form.

Which property of textbox cannot be changed at runtime. What is the max size of textbox? Name Property.. Max Size- No Limit.List out controls which does not have events?shape, line controls

OLE is used for _______?Object linking and embedding, for using to other object classes likeword, excel , autocad objects in our own applications, only thing we have to add reference for these objects.

.___,__,___ are the type of combo box?1. dropdown combo2. simple combo3. dropdwon list

Timer control contains ________ no. of events.?Only One

.___ is a property to resize a label control according to your caption?Autosize

.____ property is used to lock a textbox to enter a datas.Locked = true

.____ is the difference between Listindex and Tab index.?Lisindex : Gives current index inside a listTabindex : specifies the tab order in the form

.____ property of menu cannot be set at run time.?Name

What is the difference between and Interface and an Abstract Class?

While this topic is probably more popular amongst Java or .NET peeps, don’t be surpised if asked in an interview.

An Interface basically is a contract which defines the factors (properties and methods) that a class must provide. However the interface does not specify how these factors are to be implemented.

An abstract class is similar to an interface in that it defines empty properties and methods but may include some methods and properties which are already implemented.

Functionally in VB6 they are pretty much the same. You can create standard interfaces by compiling abstract classes in Visual Basic ActiveX DLLs or EXEs, or with the MkTypLib utility. In order to implement an interface, you must use the References dialog box to set a reference to the type library or ActiveX DLL or EXE. In similar fashion, any application that uses objects which have implemented an abstract interface must also have a reference to the type library that describes the interface. Information about implemented interfaces cannot be included in the type libraries of components, because there is no way to resolve naming conflicts.

VB6 does not support inheritance but provides for using interfaces as a means of class inheritance and extension.

which type of combobox is non editable ?dropdown list.

which method of recordset is used to store records in an array?Getrows.

how can you display records page wise?use pagesize,pagecount,absolutepage property of recordset.

why recordset.recordcount returns -1??cursertype may not be forwardonly.

What are types of ActiveX Components in VB?ActiveX DLL, ActiveX Exe, ActiveX Controls, ActiveX Document DLL, ActiveX Document Exe

Default property of data control.?Name is the default property.

How do I register a component? run this command regsvr32 c:\...\MyDll.dll to registerrun this command regsvr32 \u c:\...\MyDll.dll to un-register 

What does Option Explicit refer to?Option Explicit is used to ensure that all variables that are being used in the code are declared.

How to copy & paste non text data to the Windows clipboard?For retreiving data from clipboard other then text use Clipboard.getData For assigning data to clipboard other then text use Clipboard.setDatadata

How do I make text box that displays asterisks when the user types in data such as password? Set Text Box PasswordChar Property to * .

How do I make a menu popup from a CommandButton or create menus at runtime? Use CreatePopupmenu API function.

Can I send keystrokes to a DOS application?AppActivate ("C:\windows\system32\cmd.exe") ‘ Appilcation captionSendKeys ("SA") ’For sending one stringSendKeys "% ep", 1’ For sending Clipboard data to Dos 

How do you use the Mouse OFF event?Ole Drag drop 

Option Base is used to?Option Base is to set the Index of the Array to start from 0 or 1.

How to create a label that is vertically oriented? Private Sub Form_Activate()Dim s As StringLabel1.Caption = "TopITMedia.com"For i = 1 To Len(Label1)s = s & Mid$(Label1, i, 1) & vbCrLf NextLabel1 = sEnd SubNote: You need to drag the Label1 vertically.

How to compare two strings using wildcards?Dim Mystr As StringMystr = "Street"If Mystr Like "S*" ThenMsgBox "Found"ElseMsgBox "Not found"End If

How to format dates so that they look correct in all date and langauge formats? Format$(Date, "Short Date")

How to create message boxes with those cool red X's? MsgBox "My Message", vbCritical, "My Title"

How to create a textbox that lets you insert tabs? Simply set tabstop on all the controls in a particular form to false.

How to implement hotkeys for text boxes? Create a label with your hotkey. Set the tabindex of the label to one less then the TabIndex of the textbox.

How to change the content of a Statusbar at run time? Statusbar1.Panels(1).Text = "Start"

How to load text file into a Listbox?Private Sub Command1_Click() Dim StringHold As String Open "C:\test.txt" For Input As #1 List1.Clear While Not EOF(1) Input #1, StringHold List1.AddItem StringHold Wend Close #1End Sub

How to use Undo function for Textbox or Combobox? 'Windows API provides an undo function'Do the following declares:Declare Function SendMessage Lib "User" (ByVal hWnd As _Integer, ByVal wMsg As Integer, ByVal wParam As _Integer, lParam As Any) As LongGlobal Const WM_USER = &h400Global Const EM_UNDO = WM_USER + 23'And in your Undo Sub do the following:UndoResult = SendMessage(myControl.hWnd, EM_UNDO, 0, 0)'UndoResult = -1 indicates an error.

How to toggle between Insert & Overwrite in a text box? 'Put a label on the form called 'lblOVR''Put this code in KeyUp event of FormPrivate Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)If KeyCode = vbKeyInsert ThenIf lblOVR = "Over" Then

lblOVR = "Insert"ElselblOVR = "Over"End IfEnd IfEnd Sub

'Put this code in KeyPress event of Text BoxPrivate Sub txtText_KeyPress(KeyAscii As Integer)'Exit if already selectedIf txtText.SelLength > 0 Then Exit SubIf lblOVR = "Over" ThenIf KeyAscii <> 8 And txtText.SelLength = 0 ThentxtText.SelLength = 1 '8=backspaceEnd IfElsetxtText.SelLength = 0End IfEnd Sub

What is the difference between CDbl and Val function? print Val("12345") - 12345print Val("12,345") - 12print CDbl("12,345") - 12345print CDbl("12345") - 12345

How to calculate the age based on date of birth? Dim Age as IntegerAge = Int(DateDiff("D", Birth, Now) / 365.25)

How to shell to web address? 'Put this in the click event of a controlDim iRet As Long Dim Response As IntegerResponse = MsgBox("You have chosen 'www.topitmedia.com', " & vbCrLf & "whichwill launch your web browser and" & vbCrLf & "point you to the TopITMedia.com web _site." & vbCrLf & vbCrLf & "Do you wish to continue?", vbInformation + _vbYesNo, "www.topitmedia.com.com")Select Case ResponseCase vbYesiRet = Shell("start.exe http://www.topitmedia.com", vbNormal)Case vbNoExit SubEnd Select

How to round a number to nearest 10, 100, 1000, etc.? 'Example - round to nearest 100Round(RatioBolus * Val(txtDW), 100)'Put this in BAS module { Input: Dose, Factor (10, 100, 1000, etc) & Output: Rounded dose} Public Function Round(Dose, Factor)Dim Temp As SingleTemp = Int(Dose / Factor)Round = Temp * FactorEnd Function

How to put 13 X 13 bitmaps into a menu?

'Add a picturebox control. Set 'Autosize' to 'True' with a bitmap (not an Icon) at a maximum of 13X13. 'Place these Declarations in BAS modulePrivate Declare Function VarPtr Lib "VB40032.DLL" (variable As Any) As LongPrivate Declare Function GetMenu Lib "user32" (ByVal hwnd As Long) As LongPrivate Declare Function GetSubMenu Lib "user32" (ByVal hMenu As Long, ByVal nPos As Long) As LongPrivate Declare Function SetMenuItemBitmaps Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long, ByVal hBitmapUnchecked As Long, ByVal hBitmapChecked As Long) As LongConst MF_BYPOSITION = &H400&

'Place this code into the form load event:Dim mHandle As Long, lRet As Long, sHandle As Long, sHandle2 As LongmHandle = GetMenu(hwnd)sHandle = GetSubMenu(mHandle, 0)lRet = SetMenuItemBitmaps(sHandle, 0, MF_BYPOSITION, imOpen.Picture, imOpen.Picture)lRet = SetMenuItemBitmaps(sHandle, 1, MF_BYPOSITION, imSave.Picture, imSave.Picture)lRet = SetMenuItemBitmaps(sHandle, 3, MF_BYPOSITION, imPrint.Picture, imPrint.Picture)lRet = SetMenuItemBitmaps(sHandle, 4, MF_BYPOSITION, imPrintSetup.Picture, imPrintSetup.Picture)sHandle = GetSubMenu(mHandle, 1)sHandle2 = GetSubMenu(sHandle, 0)lRet = SetMenuItemBitmaps(sHandle2, 0, MF_BYPOSITION, imCopy.Picture, imCopy.Picte)

How to make a form fade to black? Sub FormFade(frm As Form)' Makes Form Fade To Black' Example: FormFade(Form1)For icolVal% = 255 To 0 Step -1DoEventsfrm.BackColor = RGB(icolVal%, icolVal%, icolVal%)Next icolVal%End Sub

How to scroll caption on the form's title bar? Sub TitleScroll(frm As Form)Dim X As IntegerDim current As VariantDim Y As StringY = frm.Captionfrm.Caption = ""frm.ShowFor X = 0 To Len(Y)If X = 0 Thenfrm.Caption = ""current = TimerDo While Timer - current < 0.1DoEventsLoopGoTo doneElse: End Iffrm.Caption = left(Y, X)current = TimerDo While Timer - current < 0.05

DoEventsLoopdone:Next XEnd Sub

How to hide mouse cursor? Use this API function and set parameter lshow to True/False to Show/Hide the mouse cursor.Public Declare Function ShowCursor& Lib "user32" (ByVal lShow As Long)

How to check if the credit card is valid? 'Add this function to a .BAS or a form and to check whether a creditcard number is valid, call it using something like:'Valid = IsValidCreditCardNumber("4552012301230123")'Valid will then contain true or false depending on what number was passed to the function.

Public Function IsValidCreditCardNumber(ByVal pCardNumber As String) As BooleanDim CharPos As IntegerDim CheckSum As IntegerDim tChar As StringFor CharPos = Len(pCardNumber) To 2 Step -2CheckSum = CheckSum + CInt(Mid(pCardNumber, CharPos, 1))tChar = CStr((Mid(pCardNumber, CharPos - 1, 1)) * 2)CheckSum = CheckSum + CInt(Left(tChar, 1))If Len(tChar) > 1 Then CheckSum = CheckSum + CInt(Right(tChar, 1))NextIf Len(pCardNumber) Mod 2 = 1 Then CheckSum = CheckSum + CInt(Left(pCardNumber, 1))If CheckSum Mod 10 = 0 ThenIsValidCreditCardNumber = TrueElseIsValidCreditCardNumber = FalseEnd IfEnd Function

How to deal with Null strings in Access database fields? By default Access string fields contain NULL values unless a string value (including a blank string like "") has been assigned. When you read these fields using recordsets into VB string variables, you get a runtime type-mismatch error. The best way to deal with this problem is to use the built-in & operator to concatenate a blank string to each field as you read it. For example:Dim DB As DatabaseDim RS As RecordsetDim sName As String Set DB = OpenDatabase("Test.mdb")Set RS = DB.OpenRecordset("Name")sName = "" & RS![Last Name]

What are the three main differences between flexgrid control and dbgrid(Data bound Grid) control

The Microsoft FlexGrid (MSFlexGrid) control displays and operates on tabular data. It allows complete flexibility to sort, merge, and format tables containing strings and pictures. When bound to a Data control, MSFlexGrid displays read-only data.Adaptation to existing Visual Basic code for the data-bound grid (DBGrid).

dbgrid is A spreadsheet-like bound control that displays a series of rows and columns representing records and fields from a Recordset object.

The data grids are bound controls; that is, they require a data source that actually connects to a database and retrieves their data. And it seems that the root of the problem with DBGrid is that there's no data source that can be readily included along with the DBGrid control.In Visual Basic, the solution is simply to include the Data Control on the same form as DBGrid. But the Data Control is an intrinsic control; it's unavailable to anything outside of the Visual Basic environment itself. and VB 6.0 has a new set of data controls (DataGrid, DataList, DataCombo, MSHFlexGrid, MSFlexGrid) that once again are bound controls. Unlike DBGrid, though, they support OLE DB, and therefore rely on the an ADO Data Source (and in particular the ActiveX Data Objects Data Control, or ADO DC) for data access. Unlike the Data Control, the ADODC is a custom control (that is, an .OCX) that can be added to any project. In short, if you add ADO DC to your project along with theDataGrid control.

ActiveX and Types of ActiveX Components in VB ?

Standard EXEActiveX EXEActiveX DLLActiveX documentActiveX Control

What is difference between inprocess and out of process ?

An in-process component is implemented as a DLL, and runs in the same process space as its client app, enabling the most efficient communication between client and component.Each client app that uses the component starts a new instance of it.

An out of process component is implemented as an EXE, and unlike a dll, runs in its own process space. As a result, exe's are slower then dll'sbecause communications between client and component must be marshalled across process boundaries. A single instance of an out of process component can service many clients.

Advantage of ActiveX Dll over Active Exe ?

ACTIVEX DLL:=============An in-process component, or ActiveX DLL, runs in another application’s process. In-process components are used by applications or other in-process components. this allows you to wrap up common functionality (like an ActiveX Exe).

ACTIVEX EXE:=============An out-of-process component, or ActiveX EXE, runs in its own address space. The client is usually an application running in another process.The code running in an ActiveX Exe is running in a separate process space. You would usually use this in N-Tier programming.

An ActiveX EXE runs out of process while an ActiveX DLL runs in the same process space as VB app. Also, and ActiveX EXE can be run independent of your application if desired.

Explain single thread and multithread thread apartments

All components created with Visual Basic use the apartment model, whether they’re single-threaded or multithreaded. A single-threaded component has only one apartment, which contains all the objects the component provides.

This means that a single-threaded DLL created with Visual Basic is safe to use with a multithreaded client. However, there’s a performance trade-off for this safety. Calls from all client threads except one are marshaled, just as if they were out-of-process calls.

What is a Component?

If you compile an ActiveX dll, it becomes a component.If you compile an ActiveX Control, it becomes both a component and a control. Component is a general term used to describe code that's grouped by functionality. More specifically, a component in COM terms is a compiled collection of properties/methods and events.

Typically a component is loaded into your project via the References whereas an ActiveX Control is loaded into your project via "components".

What is meant by "Early Binding" and "Late Binding"? Which is better?

Early binding and late binding refer to the method used to bind an interface's properties and methods to an object reference (variable). Early binding uses type library information at design time to reference procedures, while late binding handles this at run time. Late bindinghandles this by interrogating the reference before each call to insure that it supports a particular method. Since every call to a late boundobject actually requires two calls

("Do you do this?" followed by "Okay, do it then"), late binding is much less efficient than early binding. Except where early binding is not supported (ASP, scripting, etc.), late binding should only be used in very special cases.

It is a common misconception that any code using the CreateObject function instead of Set = New is using late binding. This is not the case. The type declaration of the object variable determines whetherit is late or early bound, as in the following:

Dim A As FooDim B As FooDim C As ObjectDim D As Object

Set A = New Foo 'Early BoundSet B = CreateObject("FooLib.Foo") 'Early BoundSet C = CreateObject("FooLib.Foo") 'Late BoundSet D = New Foo 'Late Bound

What are the Advantages of disconnected recordsets?

A disconnected Recordset, as its name implies, is a Recordset that lacks a connection.

seen that a Recordset that does not have a database connection can be very useful as a tool in your programming. It can save you time and effort and make your code more scalable.

In order to create a disconnected Recordset two Recordset properties must be set appropriately.It is a requirement that the CursorLocation property is set to adUseClient and the LockType property is set to adLockBatchOptimistic. Note that the CursorType will default to adUseStatic if

we don't explicitly state that it should be set to adUseClient.) i.e

rst.LockType = adLockBatchOptimisticrst.CursorLocation = adUseClient

However, we've recently discovered that these steps aren't necessary. VB automatically assigns batch optimistic locking to newly created,connectionless recordsets. And, of course, without a connection, a recordset can't have any other cursor but a client-side one. To create one of these structures, then, the only thing you need do is createthe object variable instance. After that, you can simply begin adding fields to the construct.

To add fields, you use the Fields collection's Append method. This method requires two parameters , the field name and the field data type. So, to create a connectionless recordset with two fields,you'd use code similar to:

Dim rst As ADODB.RecordsetSet rst = New ADODB.Recordset

rst.Fields.Append "CustID", adVarCharrst.Fields.Append "CustName", adVarChar

Additional, optional Append method parameters include DefinedSize and Attrib. The DefinedSize argument takes the size of the field. Fill the Attrib parameter with constants that define additional field characteristics, such as whether it will allow null values or is updatable.Since, in our technique, we want the fields to mirror the structure of the original recordset, we'll simply use existing values for these parameters.

Disconnected Recordsets, first available with ADO 2.0, are the most commonly used mechanism to retrieve a Recordset and open a connection for only the necessary amount of time, thus increasing scalability. They are call disconnected because the connection to the database is closed.The collections, properties, and methods of a disconnected Recordset are still available even though the connection is closed. This frees up server resources, given that the number of open connections is limited and database locking is a non-issue.

What are Benefits of wrapping database calls into MTS transactions?

If database calls are made within the context of a transaction, aborting the transaction will undo and changes that occur within that transaction.This removes the possibility of stranded, or partial data. Transaction that uses the Microsoft® Transaction Server (MTS) environment. MSMQ implicitly uses the current MTS transaction if one is available.

BENIFTIS OF USING MTS :Database Pooling, Transactional operations, Deployment, Security, Remote Execution This allows MTS to reuse database connections. Database connections are put to ?sleep? As opposed to being created and destroyed and are activated upon request.

How to register a component?

Compiling the component, running REGSVR32 MyDLL.dll

Controls which do not have events ?

Shape and line controls are useful for drawing graphical elements onthe surface of a form. These controls don't support any events; theyare strictly for decorative purposes.

EXTRA INFO::The image, shape and line controls are considered to be lightweight controls; that is, they support only a subset of the properties, methods, and events found in the picture box. Because of this, they typically require less system resources and load faster than the picture box control.

What are the Control Categories

a)Intrinsic controls:such as the command button and frame controls. These controls are contained inside the Visual Basic .exe file. Intrinsic controls are always included in the toolbox

b)ActiveX controls:which exist as separate files with a .ocx file name extension. These include controls that are available in all editions of Visual Basic (DataCombo, DataList controls, and so on) and those that are available only in the Professional and Enterprise editions (such as Listview, Toolbar, Animation, and Tabbed Dialog). Many third-party ActiveX controls are also available.

c)Insertable Objects:such as a Microsoft Excel Worksheet object containing a list of all your company's employees, or a Microsoft Project Calendar object containing the scheduling information for a project. Since these canbe added to the toolbox, they can be considered controls.Some of these objects also support Automation (formerly called OLE Automation),which allows you to program another application's objects from within a Visual Basic application.

DIFF between Image and Picture box controls?

The sizing behavior of the image control differs from that of the picture box. It has a Stretch property while the picture box has an AutoSize property. Setting the AutoSize property to True causes a picture box to resize to the dimensions of the picture; setting it to False causes the picture to be cropped (only a portion of the picture is visible). When set to False (the default) , the Stretch property of the image control causes it to resize to the dimensions of the picture.Setting the Stretch property to True causes the picture to resize to the size of the image control, which may cause the picture to appeardistorted.

Default property of data control ?...

connect property......

Define the scope of Public, Private, Friend procedures?

The set of public variables, methods, properties, and events described in a class module define the interface for an object. The interface consists of the object members that are available to a programmer who's using the object from code.

You can create private variables, methods, properties, and events that are used by other procedures within the class module but are not part of the object's public interface. Additionally, constants user-defined types, and Declare statements within a class module must always be

private.

The Friend keyword makes a procedure private to the project: The procedure is available to any code running within the project, but it is not available to a referencing project.

Describe Database Connection pooling relative to MTS ?

This allows MTS to reuse database connections. Database connections are put to ?sleep? as opposed to being created and destroyed and are activated upon request.

Object pooling is an important design concept required for high-performance applications. A performance optimization based on using collections of preallocated resources, such as objects or database connections. Pooling results in more efficient resource allocation.

Difference between a function and a subroutine ?

A function accepts any number of parameters (possibly zero), does something with them, and returns a value. A subroutine is performs an action, but doesn't return a value.

There are two differences between a function and a subroutine: A)How they are invoked. B)How they are accessed.

A function call has the following syntax ::function(arg1, arg2, ...)where: function Is the name of the function. arg1, arg2, ... Are the arguments.

A subroutine call has the following syntax::subroutine (arg1, arg2, ... {outputfield|'format'})where: subroutine -->Is the name of the subroutine. arg1, arg2, ... Are the arguments. {outputfield|'format'} Is the name of the output field or its format.

In addition, on some platforms, the functions are available immediately; whereas, the subroutines are available in a special subroutine library that you must access. 

Difference between Linked Object and Embedded Object?

Embedding objects -When you embed an object, a copy of the object is inserted into the destination document. There's no link to the original file. When you change information in the source document, no changes will be reflected in the destination document. The actual data for the object is stored within the destination file. To make changes to the embedded object, double click it and it will launch the original application the source file was in. 

Linking objects -Information is updated when you modify the original source file when you use a linked object. This dynamic updating is very handy for things such as the aforementioned monthly report. You can open up the Excel spreadsheet that is referenced within your Word document.Make changes to the spreadsheet, close Excel, and when you open your Word document... viola! The changes are already there. If that object is linked to ten other Word files, the changes are already in those ten files, too! actually linking or embedding an object is fast and easy.

Difference between listbox and combo box?

A LISTBOX CONTROL displays a list of items from which the user can select one or more. If the number of items exceeds the number that can be displayed, a scroll bar is automatically added to the ListBox control. A COMBOX CONTROL combines the features of a text box and a list box. This control allows the user to select an item either by typing text into the combo box, or by selecting it from the list.DIFF::Generally, a combo box is appropriate when there is a list of suggested choices, and a list box is appropriate when you want to limit input to what is on the list. A combo box contains an edit field, so choices not on the list can be typed in this field.

Difference between Dynaset and Snapshot?

All Recordset objects are constructed using records (rows) and fields (columns). There are five types of Recordset objects:

Table-type Recordset ::representation in code of a base table that you can use to add, change, or delete records from a single database table (Microsoft Jet workspaces only).

Dynaset-type Recordset ::the result of a query that can have updatable records. A dynaset-type Recordset object is a dynamic set of records that you can use to add, change, or delete records from an underlying database table or tables. A dynaset-type Recordset object can contain fields from one or more tables in a database. This type corresponds to an ODBC keyset cursor.

Snapshot-type Recordset ::a static copy of a set of records that you can use to find data or generate reports. A snapshot-type Recordset object can contain fields from one or more tables in a database but can't be updated. This type corresponds to an ODBC static cursor.

Forward-only-type Recordset::identical to a snapshot except that no cursor is provided. You can only scroll forward through records. This improves performance in situations where you only need to make a single pass through a result set. This type corresponds to an ODBC forward-only cursor.

Dynamic-type Recordset ::a query result set from one or more base tables in which you can add, change, or delete records from a row-returning query. Further, records other users add, delete, or edit in the base tables also appear in your Recordset. This type corresponds to an ODBC dynamic cursor (ODBCDirect workspaces only).

Difference Listindex and Tab index?

LIST INDEX::Returns or sets theindex of the currently selected item in the control. Not available at design time.Default LIST INDEX IS -1 for ComboBox, DirListBox, and DriveListBox controlsTAB INDEX::Returns or sets thetab order of most objects within their parent form. Visual Basic automatically renumbers the TabIndex of other controls to reflect insertions and deletions. You can make changes atdesign time using theProperties window or atrun time in code.The TabIndex property isn't affected by the ZOrder method.

Difference modal and moduless window?

MODAL forms are forms which require user input before any other actions can be taken place. In other words, a modal form has exclusive focus in that application until it is dismissed. When showing a modal form, the

controls outside this modal form will not take user interaction until the form is closed. The internal MsgBox and InputBox forms are examples of modal forms. To show a form modally, use the syntax:MyForm.SHOW.vbModal ' a predeclared constant for 1MODELESS forms are those which are shown but do not require immediate user input. MDI child forms are always modeless. To show a form modeless, use the syntax:: MyForm.SHOW

Difference Object and Class?

Classes and objects are separate but related concepts. Every object belongs to a class and every class contains one or more related objects.1)A Class is static. All of the attributes of a class are fixed before,during, and after the execution of a program. The attributes of a class don't change.The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed.2)An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that lifetime, the attributes of the object may undergo significant change.So basically the difference between a class and an object is that a class is a general concept while objects are the specific and real instances that embody that concept. When creating an object oriented program we define the classes and the relationships between the classes . We then execute the program to create, update, and destroy the objects which are the specific realization of these classes.

Difference Query unload and unload in form?

Occurs before a form or application closes. When an MDIForm object closes, the QueryUnload event occurs first for the MDI form and then in all MDI child forms. If no form cancels the QueryUnload event, the Unload event occurs first in all other forms and then in an MDI form. When a child form or a Form object closes, the QueryUnload event in that form occurs before the form's Unload event.

Difference Declaration and Instantiation an object?

Dim obj as OBJ.CLASS with eitherSet obj = New OBJ.CLASS orSet obj = CreateObject(?OBJ.CLASS?) orSet obj = GetObject( ,? OBJ.CLASS?)orDim obj as New OBJ.CLASS

Set object = Nothingensure the object is release from the memory.

If this object is a form, you can add set myform = nothing and Form_Unload() event.Maintain a habit of remove the object by using set object = nothing which will benefit at last.Visual Basic is supposed to automatically release objects when they go out of scope. To free up some memory usage, you can set the object tonothing.

Draw and explain Sequence Modal of DAO

Connection,Container,Database,DBEngine,Document,Error,Field,Group,IndexParameter Property,QueryDef,Recordset,Relation,TableDef,User,Workspace

Version |Year |Significant Changes and New Features of Visual Basic?

1 1991 initial release, with drag and drop GUI creation2 1992 ODBC, object variables3 1993 Access Engine, OLE 2.0, Crystal Reports, new tools and controls4 1995 classes, OCXs5 1997 compiler, ActiveX controls6 1998 web support, windowless controls, designers, data sources.NET 2001 XML, SOAP, inheritance, structured exception handling

How can objects on different threads communicate with one another?

Processes communicate with one another through messages, using Microsoft's Remote Procedure Call (RPC) technology to pass information to one another. There is no difference to the caller between a call coming from a process on a remote machine and a call coming from another process on the same machine.

Multithreaded applications must avoid two threading problems: deadlocks and races. A deadlock occurs when each thread is waiting for the other to do something

How can you force new objects to be created on new threads?

The CreateThread function creates a thread to execute within the virtual address space of the calling process.

To create a thread that runs in the virtual address space of another process Creating a new thread is as easy as declaring it and supplying it with a delegate to the method where the thread is to start. When you are ready to begin execution on the thread, call the Thread.Start Method. There are special considerations involved when working with multiple threads of execution.

To create a new thread of execution====================================Declare the thread.******************' Visual BasicDim myThread as System.Threading.Thread

// C#System.Threading.Thread myThread;

Instantiate the thread with the appropriate delegate for the starting point of the thread. Use the AddressOf operator to create the delegatein Visual Basic, or create a new ThreadStart object in C#.*******************' Visual BasicmyThread = New System.Threading.Thread(AddressOfmyStartingMethod)

// C#myThread = new System.Threading.Thread(newSystem.Threading.ThreadStart(myStartingMethod));

call the Thread.Start method to start the thread.*******************' Visual BasicmyThread.Start()

// C#

myThread.Start();

How does a DCOM component know where to instantiate itself?

To create a remote instance of a script component, call the CreateObject method, passing it the name of the remote computer as a parameter. If the remotable attribute of a script component's <registration> element has been set to "true," the script component can be instantiated remotely from another computer using Distributed COM (DCOM).Both computers must have basic DCOM installed. Note The ability to use CreateObject for instantiating remote script components requires Visual Basic 6.0 or later or VBScript 5.0 or later. The following Visual Basic example shows how to do this on a computer named "myserver":

Set newS = CreateObject("Component.MyComponent", "myserver")Note There can be a slight delay when you first instantiate a remote script component while DCOM establishes communication between the computers.

1. You can specify the machine on which you want to create the remote server object in DCOM config ('dcomcnfg').

2. You can specify the machine name when instantiating the remote server object.In C you can do this with a call to CoGetClassObject or CoCreateInstanceEx (instead of CoCreateInstance, which does not allow you to specify the name of the machine).In VB you can specify the name in one of the parameters in the call to CreateObject

What type of multi-threading does VB6 implement?

Apartment model threading

How to register a component?

Compiling the component, running REGSVR32 MyDLL.dll

What is Database Connection pooling (relative to MTS)

This allows MTS to reuse database connections. Database connections areput to "sleep" As opposed to being created and destroyed and are activated upon request.

What is the tool used to configure the port range and protocols for DCOM communications?

DCOMCONFIG.EXE

What is a Type Library and what is it's purpose ?

The type library may represent another Visual Basic project, or any other executable component that exposes a type library.Visual Basic creates type library information for the classes you create, provides type libraries for the objects it includes, and lets you access the type libraries provided by other applications.

What are binary and project compatibility?Visual Basic’s Version Compatibility feature is a way of enhancing your components while maintaining backward compatibility with programs that were compiled using earlier versions. The Version Compatibility box, located on the Component tab of the Project Properties dialog box,

contains three options:No Compatibility:Each time you compile the component, new type library information is generated, including new class IDs and new interface IDs. There is no relation between versions of a component, and programs compiled to use one version cannot use subsequent versions.

Project Compatibility:Each time you compile the component the type library identifier is kept, so that your test projects can maintain their references to the component project. All class IDs from the previous version are maintained; interface IDs are changed only for classes that are no longer binary-compatible with their earlier counterparts. Note This is a change in Project Compatibility from Visual Basic 5.0, where all class IDs and interface IDs in the project changed if any one class was no longer binary-compatible.

Important For the purpose of releasing compatible versions of a component, Project Compatibility is the same as No Compatibility.

Binary Compatibility:When you compile the project, if any binary-incompatible changes are detected you will be presented with a warning dialog. If you choose to accept the warning, the component will retain the type library identifier and the class IDs. Interface IDs are changed only for classes that are no longer binary-compatible. This is the same behavior as Project Compatibility.If, however, you choose to ignore the warning, the component will also maintain the interface IDs. This option is only available when the compiler determines that the change was in the procedure ID or signature of a method.

Note:: When people talk about Version Compatibility, they’re usually referring to Binary Compatibility.

How to set a shortcut key for label?object.KeyLabel(keycode) [= string]You would probably create the menu item as follows:.Add "keyFile", , , "E&xit", , vbAltMask + vbCtrlMask, vbKeyEndThe default key label for vbKeyEnd is "End". Thus, the shortcut string will be created by default as "Ctrl+Alt+End".

Name the four different cursor and locking types in ADO and describe them briefly ?CURSORS::*********The cursor types are listed from least to most resource intensive.Forward Only - Fastest, can only move forward in recordsetStatic - Can move to any record in the recordset. Data is static and never changes.KeySet - Changes are detectable, records that are deleted by other users are unavailable, and records created by other users are not detected Dynamic - All changes are visible.

LOCKING TYPES::****************LockPessimistic - Locks the row once after any edits occur.LockOptimistic - Locks the row only when Update is called.LockBatchOptimistic - Allows Batch Updates.LockReadOnly - Read only. Cannot alter the data.

Name the different compatibility types when creating a COM component.No Compatibility - New GUID (Globally Unique Identifier) created, references from other

components will not work Project Compatibility - Default for a new component <Not as critical to mention this one>Binary Compatibility - GUID does not change references from other components will work

Why is it important to use source control software for source code?Modification history. Code ownership: Multiple people cannot modify the same code at the same time.

List the ADO objects?Connection - Connects to a data source; contains the Errors collectionCommand - Executes commands to the data source. The only object that can accept parameters for a stored procedure Recordset - The set of data returned from the database.Under the ADO Command Object, The Parameters collection. collection is responsible for input to stored procedures?

What two methods are called from the ObjectContext object to inform MTS that the transaction was successful or unsuccessful?SetComplete and SetAbort.

What is the benefit of wrapping database calls into MTS transactions?Aborting the transaction will undo and changes that occur within that transaction. This removes the possibility of stranded, or partial data

Describe and In Process vs. Out of Process component. Which is faster?An in-process component is implemented as a DLL, and runs in the same process space as its client app, enabling the most efficient communication between client and component. Each client app that uses the component starts a new instance of it.An out of process component is implemented as an EXE, and unlike a dll, runs in its own process space. As a result, exe's are slower then dll's because communications between client and component must be marshaled across process boundaries. A single instance of an out of process component can service many clients.

How would you declare and raise custom events in a class?a) Public Event OnVarChange();b) RaiseEvent OnVarChange[(arg1, arg2, ... , argn)]

What is the difference between a Property Let and Property Set procedure?Let - for simple variableSet - for object

What is the difference between ANSI and UNICODE strings when passed as arguments to a DLL?ANSI - one byte for a char UNICODE - two bytes per char - works only on NT

What is the difference in passing values ByRef or ByVal to a procedure?ByRef -pass the address (for string -address of address of first byte)BY REF IS VERY USEFULL When the contents itself are being modified, when there is large data. Multiple arguments are needed to be returned, instead they can be passed as reference.ByVal -pass the value (for string -it is the address of first byte)

What is the purpose of the DoEvents command?Fields execution so that the operating system can process other events. Returns number of open forms. Useful for things like ‘cancel search’ in Windows Name and define the logical tiers in a traditional 3-tiered architecture?Presentation logic - front end (HTML, Visual Basic forms)

Business Logic - Applications and components that encapsulate business logicData end - databases to store data

What is the difference between a PictureBox and Image control?Image Control - Use this to display a picture. Use it over the PictureBox because it takes less operating system resourcesPictureBox- While it can display pictures, it also acts as an area on which you can print text and graphics. Use it for home-grown graphics or print previews

Under which circumstance does a VB application ignore a Timer event?When the system is really busy doing something else and when DoEvents is being executed

What does the NewIndex property return?Used to retrieve the index of the item most recently added to a ListBox or ComboBox control

What is the purpose of the ClipControls property on a form or container?Returns or sets a value that determines whether graphics methods in Paint events repaint the entire object or only newly exposed areas. Also determines whether the Microsoft Windows operating environment creates a clipping region that excludes non-graphical controls contained by the object. Read-only at run time.

What is the purpose of the AutoRedraw property on a form or container?Setting AutoRedraw to True automatically redraws the output from these methods in a Form object or PictureBox control when, for example, the object is resized or redisplayed after being hidden by another object

Have you ever used Collections? Collection Classes?A collection is a set of Repository objects that are all connected to a common source object via a relationship collection. A collection provides a way to connect a group of dependent objects with an object that ‘contains’ them. For example, an Invoice object might have a collection of LineItem objects.

What version control systems have you used?TLIB 16-Bit add-in

How about any other database engines?Apollo OLE DB ,Apollo Server ,Apollo SQL ,FUNCky ,R&R Report Writer

What kind of components can you use as DCOM servers?active-x components, Com Dim x, y as integer. What is x and y data type?X as variant and y as integer.

What is the size of the variant data type?The Variant data type has a numeric storage size of 16 bytes and can contain data up to the range of a Decimal, or a character storage size of 22 bytes (plus string length), and can store any character text.

What is the return type of Instr and Strcmp?Instr – integer (Numeric position)Strcmp - integer ( if both the string are equal they result = 0)Strcmp (Str1, Str2, Comparetype)Comparing mode = 0 – Binary Comparing1 – Textual Comparing

What is the max size allowed for Msgbox Prompt and Input Box?1024

Max label caption length. –2,048

Max Text box length –32,000

Max Control Names length –255.

Extension in Visual BasicFrm, bas, cls, res, vbx, ocx, frx, vbp, exe

What is frx?When some controls like grid and third party control placed in our application then it will create frx in run time.

Name some date functionDateadd(), Datediff(), Datepart(), Cdate()

What will be the result for 15/4 and 15\415/4 = 3.75 and 15\4 = 3

What is keyword used to compare to objects?ISOperator – Returns Boolean.

How many procedures are in VB?2. function and sub procedures.  Function Will return value but a sub procedure wont return values…

Where will we give the option explicit keyword and for what?In the general declarations section. To trap undeclared variables.

What is Friend Variable?Scope sharable between projects.

What is binding? What are types of binding?Assigning variable with defined memory space. Late Binding - Memory size is allotted in later stage.Ex:- Dim x as objectEarly Binding - Memory size is allotted while declaring itself. New Key word is important.Ex:- Dim x as New Object

What is the difference between Property Get, Set and Let.Set – Value is assigned to ActiveX Object from the form.Let – Value is retried to ActiveX Object from the form.Get- Assigns the value of an expression to a variable or property.

What is Mask Edit and why it is used?Control. Restricted data input as well as formatted data output.

Drag and Drop state numbers and functions.State 0 – Source control is being dragged with the range of a target.1 – Out of the range of a target.

2 – One positon in the target to another.

What are the type of validation available in VB?Field, Form

With in the form we want to check all the text box control are typed or not? How?For each currentcontrol in controls if typeof currentcontrol is TextBox then end if next

What is control array and How many we can have it with in the form?Group of control share the same name. Max 32, 767.

What is the default model of the form? And what is it number?VbModaless – 0 (Zero) – We can able to place another window above this form.

Suppose from form1 to form2 object property settings will arise to ?Invalid procedure call or argument (Run time error – 5)

What is the diff between the Std and Class Module?Std Global with in the project. Cls Global through out the all project only thing is we want to set the type lib. Class Modules can be Instantiated.

Different type of Instantiation?Private – Only for the Specific Module.Public not creatable – Private & PublicMulti Use - Variable we have to declare.Single Use – Not possible through dll.Global Multiuse – Have variable not Required toDeclare. Global Single Use - Only for exe.

How to declare Dll Procedure?Declare function "<Function Name>" lib "<Lib Name>" Alias "<Alias Name>" (Arg, …..) as Return type.

What is MDI form? MDI Styles?We can have only one MDI form for a project. Multiple Document Interface. This form type is VBModal. We have set the Child property of the forms to True to place forms inside this MDI.Style availables 1. VbCascade 2. VbTitle Horizontal

How many images can be placed in the image list ?64

Diff type of Datatypes?LOB (Large Object Data type).CLOB (Stores Character Objects).BLOB ( Store Binary Objects such as Graphic, Video Chips and Sound files).BFILE(Store file pointers to LOB It may Contain filename for photo’s store on CD_ROM).

What is Zorder Method?Object.Zorder = 1 or 0 Place a Specified mdiform form or control at the front or back of the z-order with n its Graphical Level.

What is diff between the Generic Variable and Specific Variable?Generic Variable:Create Object Ex:-Ole-Automation . No need refer the object library.Specific Variable: Binding Procedure Early and Late Binding ( Can be Remove from the Memory).

What are properties available in Clip Board?

No Properties Available. Only the methods they are SetText, GetText, Setdata(), Getformat(), Clear.

What is Dll?Libraries of procedure external to the application but can be called from the application.

What is Tabstrip control? What is the starting Index value? How to locate it?It is tab control to place our controls with in the form in multiple sheets.Index starts with 1. And to identifyIf Tabstrip1.SelectedItem.Index = 1 Then…..End if

Why we use Treeview Control?To list the hierarchial list of the node objects. Such of files and Directories.

Why we need OLE-Automation? Advantages?Enables an application to exposes objects and methods to other Applications.No need to reserve memory. No need to write functions.Object library that simplify programming tasks. i.e., No need to Object library. (OLB, TLB).

What is the diff between the Create Object and Get object?Create Object - To create an instance of an object.Get Object – To get the reference to an existing object.

Have you create Properties and Methods for your own Controls?Properties – Public variable of a ClassMethod – Public procedure of a class

What is Collection Objects?Similarly to arrays but is preferred over an array because of the following reasons.1. A collection objects uses less Memory than an array.2. It provides methods to add and delete members.3. It does not required reason statement when objects are added or deleted.4. It does not have boundary limitations.

What is Static Variable?Its Scope will be available through out the life time.

Private Dim x as integer. Is it true?No. Private cannot be used in front of DIM.

What is Implicit?Instance of specific copy of a class with its own settings for the properties defined in that class. Note: The implicity defined variable is never equal to nothing.

What are the scope of the class?Public , private, Friend

Can we able to set Instancing properties like Singleuse, GlobalSingleuse to ActiveXDll?No.

In project properties if we set Unattended what is it mean?This cannot have user interface. This can be used for the COM creation.

What are the Style Properties of Combo Box?

Simple, Dropdown list – We can type and select.Dropdown Combo – Only Drop Down.

What are the Style properties of List Box?Simple –Single Select , Extended. – Multiple Select.

What are the different types of Dialog Box?Predefined, Custom, User Defined.

What is Parser Bug?It is difficult to use database objects declared in a module from within a form.

What is the Dll required for running the VB?Vbrun300.dll

Can We create CGI scripts in VB?Yes.

How to change the Mouse Pointer?Screen.MousePointer = VBHourGlass/VBNormal.

How to check the condition in Msgbox?If(Msgbox("Do you want to delete this Record",VbYesNo)=VbYes)Then End if

What is difference between datagrid and flexgrid?Datagrid – Editable.Flexigrid – Non-Editable. (Generally used for Read only purpose.)

What is ADO? What are its objects ?ActiveX Data Object. ADO can access data from both flat files as well as the databases. I.e., It is encapsulation of DAO, RDO, and OLE that is why we call it as OLE-DB Technology. Objects are Connection, Record Set, Command, Parameter, field, Error, Property.

What is Dataware Control?Any control bound to Data Control.Ex:- Textbox, Check Box, Picture Box, Image Control, Label, List box, Combo Box, DB Combo

What are two validate with Data Control?Data_Validate, Data_Error.

Record set types and Number available in VB?3. 1- Dynaset, 0 – Table, 2 – Snap Shot.

Referential Integrity (Take care By jet database Engine).Cascade Delete, Cascade Update – is done setting property of Attributes.DbRelationDeleteCascade,DbRelationUpdateCascade.

What are the locks available in Visual Basic?Locking is the process by which a DBMS restricts access to a row in a multi-user environment4 types of locks. They are1.Batch Optimistic2.Optimistic3.Pessimistic4.ReadOnly

What is the diff between RDO and ADO?RDO is Hierarchy model where as ADO is Object model. ADO can access data from both flat files as well as the data bases. I.e., It isencapsulation of DAO, RDO , OLE that is why we call it as OLE-DB Technology.

How can we call Stored procedure of Back End in RDO and ADO ?In RDO – We can call using RDO Query Objects.In ADO – We can call using Command Objects.

What is the different between Microsoft ODBC Driver and Oracle OBDC Driver?Microsoft ODBC driver will support all the methods and properties of Visual Basic. Where as the Oracle not.

What are the Technologies for Accessing Database from Visual Basic?DAO, Data Control, RDO, ODBCDIRECT, ADO, ODBC API.

Calling Stored Procedures in VB?1. Calling Simply the Procedure with out Arguments "Call ProcedureName}"

If it is with Arguments Means thenDeclare the Query Def qySet Qy as New Query defQy.SQL = "{Call ProcedureName(?,?,?)}"qy(0)=val(Txt1.Text)qy(1)=val(Txt2.Text)qy(2)=val(Txt3.Text)Set Rs = Qy.OpenresultSetTxt(1)=Rs.RdoColumns(0)

What is MAPI ?Messaging Application programing Interface.

Different type of Passing Value?By value, By ref, Optional, Param Array.Note:- Optional keyword cannot be used while declaring arguments for a function using param array.

What are the different types of error?Syntax Errors, Runtime , Logic.

What is Seek Method which type of record set is available this?Only in DbOpenTables.Syntax: rs.index = "empno"rs.seek "=" , 10If with our setting the rs.index then run time error will occur.

What is Centralization Error Handling?Writing funciton and calling it when error occurs.

Handling Error in Calling chain.This will call the top most error where the error is handled.

To connect the Data Control with Back end What are all the properties to be set?Data source Name, Record Source Name

How to trap Data Base Error?

Dim x as RDOErrorX(0).DesX(1).Number

What is view Port?The area under which the container provides the view of the ActiveX Document is known as a view port.

What methods are used for DBGrid in unbound mode?AddData, EditData, Readdata, WriteData.

How to increase the Date corresponding with month,date,year?DateSerial(year(Now),Month(Now)+1,1)Hour, min, sec, month, year, DateSerial, dateadd, datediff, weekday, datevalue, timeserial,timevalue.

Setting the Cursors.Default Cursor – 0ODBC Cursor (Client side) – 1ServerSide Cursors (More Network traffic) - 2

Cursor managementClient Batch – Batch up the Multiple SQL Statements in a single string and Send them to the Server at one time.

What are the record set types?RdOpenFowardOnly 0 (Default used only for the read only purpose)RdOpenStatic 1RdOpenDynamic 2RdOpenKeySet 3 (Normally used for the live project)

Diff types of Lock Types?RdConcurReadOnly 0 (Default)RdConcurLock 1 (Pessimistic Locking)RdConcurRowver 2 (Optimistic Lociking)RdConcurValues 3RdConcurBatch 4

What are the RDO Methods and Events?Methods EventsBegin Trans ValidateCommit Trans RepositionRollback Trans ErrorCancel Query CompliedRefreshUpdate ControlsUpdate row

What is Static Cursor?In ADO Snap Shot is called so.

What is Mixed Cursors?Static + Keyset

What is FireHouse Cursors?Forward Only Some time Updateable

What is DBSqlPassThrough?It will By Passing the Jet Query Processor.

What is DBFailError?Rolls Back updates if any errors Occurs.

DSN Less Connection?"Server=Oracle; Driver={Microsoft ODBC for Oracle};"

What is RdExecDirect?Bypasses the Creation of a stored procedure to execute the query. Does not apply to Oracle.

RdoParameter Object RdoParameterConstantDirection RdparamInputRdparamInputOutputRdParamOutputNameType]Value

How to implement hotkeys for text boxes Create a label with your hotkey. Set the tabindex of the label to one less then the TabIndex of the textbox

How to create a textbox that lets you insert tabs Simply set tabstop on all the controls in a particular form to false.

How to make text box that displays "*" when you tpye in (For password purpose) Just set the PasswordChar property of the text box or rich text box to "*" or your favorite character. 

How to create message boxes with those cool red X's MsgBox "My Message", vbCritical, "My Title"

How to format dates so that they look correct in all date and langauge formats Command1.Caption = Format$(Date, "Short Date")

How to compare two strings using wildcards Dim Mystr As StringMystr = "Street"If Mystr Like "S*" ThenMsgBox "Found"ElseMsgBox "Not found"End If

How to create a label that is vertically oriented Private Sub Form_Activate()Dim s As StringLabel1.Caption = "Binoj's VB Land"For i = 1 To Len(Label1)s = s & Mid$(Label1, i, 1) & vbCrLf Next

Label1 = sEnd Sub

Note: You need to drag the Label1 vertically

How to create multi-column combo box Add Microsoft Forms 2.0 control, there's a combo that supports multicolumns.

Combo1.ClearCombo1.ColumnCount = 2Combo1.ListWidth = "6 cm" 'Total widthCombo1.ColumnWidths = "2 cm;4 cm" 'Column widthsCombo1.AddItem "Text in column 0"Combo1.List(0, 1) = "Text in column 1"

How to set the source of one combo to be the contents of another combo sub comboA_click()comboB.text = comboA.textend sub

If you want the value selected in comboA to be added to the list of choices in comboB, the following code will do it:

sub comboA_click()comboB.AddItem comboA.textend sub

How to get ride of the quotation marks when saving strings in a text file Use the Print # statement instead of the Write # statement. The Print # statement doesn't put quotation marks around your strings.

How to include a .wav file in a .exe file Use a resource file. Include the .wav file as a custom resource. Check the resource files in the help and look at the loadresdata function.

How to enable the form close button dim bCanClose as Boolean

Then put this into the form's QueryUnload event:

If bCanClose = false then cancel = true

How to add text items with a different color in a Listbox Use the MSFlexGrid control

How to load text file into a Listbox Statusbar1.Panels(1).Text = "Start"

How to change the content of a Statusbar at run time Private Sub Command1_Click() Dim StringHold As String 

Open "C:\test.txt" For Input As #1 

List1.Clear While Not EOF(1) Input #1, StringHold List1.AddItem StringHold Wend Close #1End Sub

How to detect the change in the Textbox Private bChanged As Boolean

Private Sub Text1_Change() bChanged = TrueEnd SubPrivate 

Sub Form_Unload(Cancel As Boolean) If bChanged Then If Msgbox("Save Changes", vbYesNo, "Save") = vbYes Then 'Save Changes Here. End If End IfEnd Sub

How to make a menu popup from a Commandbutton First, create a menu with the menu editor. It should look like this:

Button Menu (Menu name: mnuBtn, Visible: False - Unchecked)....SubMenu Item 1 (Menu name: mnuSub, Index: 0)....SubMenu Item 2 (Menu name: mnuSub, Index: 1)....SubMenu Item 3 (Menu name: mnuSub, Index: 2)....SubMenu Item 4 (Menu name: mnuSub, Index: 3)

I hope you understand the above. Also create a CommandButton.

Then add this code:

Private Sub mnuSub_Click(Index As Integer)Call MsgBox("Menu sub-item " & Index + 1 & " clicked!", _vbExclamation)End Sub

Private Sub Command1_Click()Call PopupMenu(mnuBtn) End Sub

P.S. For added effect, replace the line:

Call PopupMenu(mnuBtn) 

With this one:

Call PopupMenu(Menu:=mnuBtn, X:=Command1.Left, Y:=Command1.Top + _Command1.Height) ' Even more viola!

Or this one:

Call PopupMenu(mnuBtn, vbPopupMenuCenterAlign, Command1.Left + _(Command1.Width / 2), Command1.Top + Command1.Height) 

How to copy the content of text1 into text2 If you have VB6.0 you can use the Replace Function to easily replace any Character(s) with something else, eg.

Text2 = Replace(Text1, vbCrLf, "" & vbCrLf)

Otherwise, you'll need to step though the Text yourself checking for instances of vbCrLf, e.g.

code:

Dim sString As StringDim sNewString As Strings

String = Text1While Instr(sString, vbCrLf) sNewString = sNewString & Left(sString, _Instr(sString, vbCrLf) - 1) & "" & vbCrLf sString = Mid(sString, Instr(sString, vbCrLf) + 2)WendText2 = sNewString

How to encrypt text encryption function :

Public Function Encrypt(ByVal Plain As String)For I=1 To Len(Plain) Letter=Mid(Plain,I,1)Mid(Plain,I,1)=Chr(Asc(Letter)+1)

NextEncrypt = PlainEnd Sub

Public Function Decrypt(ByVal Encrypted As String)For I=1 to Len(Encrypted) Letter=Mid(Encrypted,I,1)Mid(Encrypted,I,1)=Chr(Asc(Letter)-1)

NextDecrypt = EncryptedEnd Sub

Print Encrypt("This is just an example")

Print Decrypt("Uijt!jt!kvtu!bo!fybnqmf")

How to create menus at run time Dim index As Integer index = mnuHook.Count Load mnuHook(index)mnuHook(index).Caption = "New Menu Entry" mnuHook(index).Visible = True

'mnuHook is the menu that the new entry appears after

How to put 13 X 13 bitmaps into a menu 'Add a picturebox control. 'Set 'Autosize' to 'True' with a bitmap (not an Icon) 'at a maximum of 13X13. 

'Place these Declarations in BAS module

Private Declare Function VarPtr Lib "VB40032.DLL" (variable As Any) As LongPrivate Declare Function GetMenu Lib "user32" (ByVal hwnd As Long) As LongPrivate Declare Function GetSubMenu Lib "user32" (ByVal hMenu As Long, ByVal nPos As Long) As LongPrivate Declare Function SetMenuItemBitmaps Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long, ByVal hBitmapUnchecked As Long, ByVal hBitmapChecked As Long) As Long

Const MF_BYPOSITION = &H400&

'Place this code into the form load event:

Dim mHandle As Long, lRet As Long, sHandle As Long, sHandle2 As LongmHandle = GetMenu(hwnd)sHandle = GetSubMenu(mHandle, 0)lRet = SetMenuItemBitmaps(sHandle, 0, MF_BYPOSITION, imOpen.Picture, imOpen.Picture)lRet = SetMenuItemBitmaps(sHandle, 1, MF_BYPOSITION, imSave.Picture, imSave.Picture)lRet = SetMenuItemBitmaps(sHandle, 3, MF_BYPOSITION, imPrint.Picture, imPrint.Picture)lRet = SetMenuItemBitmaps(sHandle, 4, MF_BYPOSITION, imPrintSetup.Picture, imPrintSetup.Picture)sHandle = GetSubMenu(mHandle, 1)sHandle2 = GetSubMenu(sHandle, 0)lRet = SetMenuItemBitmaps(sHandle2, 0, MF_BYPOSITION, imCopy.Picture, imCopy.Picture)

How to round a number to nearest 10, 100, 1000, etc. 'Example - round to nearest 100Round(RatioBolus * Val(txtDW), 100)

'Put this in BAS modulePublic Function Round(Dose, Factor)'Purpose: Round a dose'Input: Dose, Factor (10, 100, 1000, etc)'Output: Rounded dose

Dim Temp As SingleTemp = Int(Dose / Factor)Round = Temp * Factor

End Function

How to shell to web address 'Put this in the click event of a control

Dim iRet As Long Dim Response As Integer

Response = MsgBox("You have chosen 'www.rxkinetics.com', " & vbCrLf & "whichwill launch your web browser and" & vbCrLf & "point you to the Kinetics web _site." & vbCrLf & vbCrLf & "Do you wish to continue", vbInformation + _vbYesNo, "www.rxkinetics.com")Select Case ResponseCase vbYesiRet = Shell("start.exe http://www.rxkinetics.com", vbNormal)Case vbNoExit SubEnd Select

How to perform generic error handling routine 'Begin error handle codeOn Error GoTo ErrHandler

'Insert code to be checked

'Stop error trapping & exit functionOn Error GoTo 0Exit Function

ErrHandler:Dim strErr As StringstrErr = "Error " & Err.Number & " " & Err.Description MsgBox strErr, vbCritical + vbOK, "Error message"

How to check for 4-digit year date Public Function ValidDate(MDate)'Purpose: Check for 4 digit yyyy DATE'Input: String from text box'Output: True or False

'Default is falseValidDate = False

'Exit if length less than "m/d/yyyy"If Len(MDate) < 8 Then Exit Function

'Exit if not a valid date wrongIf IsDate(MDate) = False Then Exit Function

'Exit if not ending or starting with "yyyy"Dim StartDate As StringDim EndDate As String

EndDate = Right(MDate, 4)StartDate = Left(MDate, 4)

If ValidChar(EndDate, "0123456789") = False And _ValidChar(StartDate, "0123456789") = False Then Exit Function

'Set to true if it passes all these tests!ValidDate = True

End Function

How to calculate the age based on date of birth 'Convert text to DateDim Birth as DateBirth = DateValue(txtDOB)

'Calculate ageDim Age as IntegerAge = Int(DateDiff("D", Birth, Now) / 365.25)

How to tell the difference between CDbl and Val function print Val("12345")12345

print Val("12,345")12

print CDbl("12,345")12345

print CDbl("12345")12345

How to code Toolbar click events Private Sub Toolbar1_ButtonClick(ByVal Button As Button)'Handle button clicksSelect Case Button.KeyCase Is = "Exit"'If user clicks the No button, stop ExitIf MsgBox("Do you want to exit", vbQuestion + vbYesNo + _vbDefaultButton2, "Exiting Code Bank") = vbNo Then Exit SubCall ExitProgramCase Is = "Repair"Call RepairdbCase Is = "Delete"Call DeleteRoutineCase Is = "Edit"Call EditRoutineCase Is = "New"Call NewRoutineCase Is = "Copy"Call CopyToClipboardCase Is = "Help"Call ShowHelpContentsEnd Select

End Sub

How to copy text to the clipboard 'First clear the clipboardClipboard.Clear

'Select Text in txtBox & copy to clipboardClipboard.SetText txtBox.Text, vbCFText

How to copy text from the clipboard 'Select Text in txtBox & copy from clipboardtxtBox.SelText = Clipboard.GetText 

'Or replace entire texttxtBox.Text = Clipboard.GetText

How to use Undo function for Textbox or Combobox 'Windows API provides an undo function

'Do the following declares:Declare Function SendMessage Lib "User" (ByVal hWnd As _Integer, ByVal wMsg As Integer, ByVal wParam As _Integer, lParam As Any) As Long

Global Const WM_USER = &h400Global Const EM_UNDO = WM_USER + 23

'And in your Undo Sub do the following:UndoResult = SendMessage(myControl.hWnd, EM_UNDO, 0, 0)'UndoResult = -1 indicates an error.

How to toggle between Insert & Overwrite in a text box 1. Put a label on the form called 'lblOVR'

2. Put this code in KeyUp event of FormPrivate Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)If KeyCode = vbKeyInsert ThenIf lblOVR = "Over" ThenlblOVR = "Insert"ElselblOVR = "Over"End IfEnd IfEnd Sub

3. Put this code in KeyPress event of Text BoxPrivate Sub txtText_KeyPress(KeyAscii As Integer)'Exit if already selectedIf txtText.SelLength > 0 Then Exit Sub

If lblOVR = "Over" ThenIf KeyAscii <> 8 And txtText.SelLength = 0 ThentxtText.SelLength = 1 '8=backspaceEnd IfElsetxtText.SelLength = 0End If

End Sub

How to use the advanced feature of MsgBox 'This method works well, unless you need to save the 'answer from your Select Case for later use. If you do, 'you'll need to use the more standard form of 'prompting for the answer in a variable. 

Select Case MsgBox("Would you like to save the file somefile.txt", _vbApplicationModal + vbQuestion + YesNoCancel, App.Title)

Case vbYes'Save then fileCase vbNo'Do something for NoCase vbCancel'Do something else for CancelEnd Select

'If only need yes/no answer then this code may'work better

If MsgBox("Do you really want to exit Code Bank", _vbQuestion + vbYesNo + vbDefaultButton2, "Exiting Code Bank") = vbNo Then Exit Sub

How to capture keys pressed to use as keyboard shortcuts 'Set the KeyPreview Property of the form to True

'Put this code in the KeyDown even of the form'Look up Key code constants in VB help for other key codes

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)'Capture Alt keyDim AltDownAltDown = (Shift And vbAltMask) > 0

'Alt + A = Shortcut for AddNew If AltDown And KeyCode = vbKeyA Then ' A = AddData1.Recordset.AddNewEnd If

End Sub

How to call a Command button without clicking it cmdCommand = TrueHow to make Crystal Reports run faster If Crystal Reports' speed is lacking although your report contains no large graphics or large numbers of groups, change these two lines in your CRW.INI file to solve disk swapping problems: 

MaxRecordMemory=0MetapageSpillLimit=100

How to fix the problem of playing the .wav file only once 

Always include the "Close" statement before "Open"

MMControl1.Command = "Close"MMControl1.Filename = "C:\1.mid"MMControl1.Command = "Open"MMControl1.Command = "Play"

How to show a modeless form frmPass.Show vbModelessHow to show a modal form frmPass.Show vbModal

How to change the button's foreground color To use the Microsoft Control: Microsoft Forms 2.0 Object Library

How to change the mouse pointer Screen.MousePointer = 0 'DefaultScreen.MousePointer = 11 'Hourglass

How to use SetAttr function SetAttr "C:\data.txt", vbNormalSetAttr "C:\data.txt", vbReadOnly

How to add something to an existing file by overwriting it Open "C:\data.txt" For output As #1Do While Not EOF(1)Print #1, "Overwrite the file!"Close #1

How to add something to an existing file (with data) Open "C:\data.txt" For append As #1Do While Not EOF(1)Print #1, "Append Something!"Close #1

How to read a file character by character Do While Not EOF(1)myChar = Input(1, #1) 'one char a lineWholeWord = WholeWord & myCharLoop

How to search Listboxes as you type By changing the SendMessage Function's "ByVal wParam as Long" to 

"ByVal wParam as String", we change the search ability from first letter only, to "change-as-we-type" searching. 

Here's some example code. Start a new Standard EXE project and add 

a ListBox (List1) and a TextBox (Text1), then paste in the following code : 

option Explicit

'Start a new Standard-EXE project.'Add a textbox and a listbox control to form 1'Add the following code to form1:

private Declare Function SendMessage Lib "User32" Alias "SendMessageA" (byval hWnd as Long, byval wMsg as Integer, byval wParam as string, lParam as Any) as Long

Const LB_FINDSTRING = &H18F

private Sub Form_Load()

With List1.Clear.AddItem "RAM".AddItem "rams".AddItem "RAMBO".AddItem "ROM".AddItem "Roma".AddItem "Rome".AddItem "Rommel".AddItem "Cache".AddItem "Cash"End With

End Sub

private Sub Text1_Change()List1.ListIndex = SendMessage(List1.hWnd, LB_FINDSTRING, Text1, byval Text1.Text)End Sub

How to get the Number of Lines In a TextBox This method is straightforward: it uses SendMessage to retrieve the 

number of lines in a textbox. A line to this method is defined as a 

new line after a word-wrap; it is independent of the number of hard 

returns in the text.

Declarations 

Public Declare Function SendMessageLong Lib "user32" Alias 

"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long,ByVal 

wParam As Long, ByVal lParam As Long) As Long

Public Const EM_GETLINECOUNT = &HBA 

The Code 

Sub Text1_Change()Dim lineCount as LongOn Local Error Resume Next

'get/show the number of lines in the edit controllineCount = SendMessageLong(Text1.hwnd, EM_GETLINECOUNT, 0&, 0&)Label1 = Format$(lineCount, "##,###")End Sub 

Special Note 

The textbox passed to the SendMessage API must have its multiline 

property set to true at design time. The EM_GETLINECOUNT message 

does not pass additional parameters to the API in the wParam or lParam variables. These must be 0. 

How to get rid of leading zeros in strings Function KillZeros(incoming as string) as string KillZeros = CStr(CInt(incoming)) End Function 

How to use Mid function Dim MyString, FirstWord, LastWord, MidWordsMyString = "Mid Function Demo" ' Create text string.FirstWord = Mid(MyString, 1, 3) ' Returns "Mid".LastWord = Mid(MyString, 14, 4) ' Returns "Demo".MidWords = Mid(MyString, 5) ' Returns "Function Demo".

How to use Left function Dim AnyString, MyStrAnyString = "Hello World" ' Define string.MyStr = Left(AnyString, 1) ' Returns "H".MyStr = Left(AnyString, 5) ' Returns " Hello".

How to use Right function Dim AnyString, MyStrAnyString = "Hello World" ' Define string.MyStr = Right(AnyString, 1) ' Returns "d".MyStr = Right(AnyString, 6) ' Returns " World".MyStr = Right(AnyString, 20) ' Returns "Hello World".

How to use LTrim, RTrim, and Trim Functions Dim MyString, TrimStringMyString = " <-Trim-> " ' Initialize string.TrimString = LTrim(MyString) ' TrimString = "<-Trim-> ".TrimString = RTrim(MyString) ' TrimString = " <-Trim->".TrimString = LTrim(RTrim(MyString)) ' TrimString = "<-Trim->".

' Using the Trim function alone achieves the same result.TrimString = Trim(MyString) ' TrimString = "<-Trim->".

How to use Len function Dim MyStringMyString = "Hello World" ' Initialize variable.MyLen = Len(MyString) ' Returns 11.

How to add records in the database Private dbCurrent As DatabasePrivate recCategories As Recordset

Set dbCurrent = OpenDatabase(cFilePathMajor & "\Record.mdb", False)Set recCategories = dbCurrent.OpenRecordset("select * from Record")

With recCategories.AddNew!Date = Date!Time = Time.UpdateEnd With

recCategories.ClosedbCurrent.CloseSet dbCurrent = Nothing

How to use Val function This example uses the Val function to return the numbers contained in a string.

Dim MyValueMyValue = Val("2457") ' Returns 2457.MyValue = Val(" 2 45 7") ' Returns 2457.MyValue = Val("24 and 57") ' Returns 24.

How to use the advanced feature of Input Box Dim Message, Title, Default, MyValueMessage = "Enter a value between 1 and 3" ' Set prompt.Title = "InputBox Demo" ' Set title.Default = "1" ' Set default.' Display message, title, and default value.MyValue = InputBox(Message, Title, Default)

' Use Helpfile and context. The Help button is added automatically.MyValue = InputBox(Message, Title, , , , "DEMO.HLP", 10)

' Display dialog box at position 100, 100.MyValue = InputBox(Message, Title, Default, 100, 100)

How to use Str function This example uses the Str function to return a string representation 

of a number. When a number is converted to a string, a leading space is always reserved for its sign.

Dim MyStringMyString = Str(459) ' Returns " 459".MyString = Str(-459.65) ' Returns "-459.65".MyString = Str(459.001) ' Returns " 459.001".

How to use Instr function This example uses the InStr function to return the position 

of the first occurrence of one string within another.

Dim SearchString, SearchChar, MyPosSearchString ="XXpXXpXXPXXP" ' String to search in.SearchChar = "P" ' Search for "P".

' A textual comparison starting at position 4. Returns 6.MyPos = Instr(4, SearchString, SearchChar, 1) 

' A binary comparison starting at position 1. Returns 9.MyPos = Instr(1, SearchString, SearchChar, 0)

' Comparison is binary by default (last argument is omitted).MyPos = Instr(SearchString, SearchChar) ' Returns 9.

MyPos = Instr(1, SearchString, "W") ' Returns 0.

How to read a file line by line Do While Not EOF(1)Line Input #1, LineHolderLineHolder = LineHolder + 1Loop

How to select all text when a TextBox gets focus Public Sub TextSelected()Dim tBox As TextBoxSet tBox = Screen.ActiveControlIf TypeOf tBox Is TextBox ThentBox.SelStart = 0tBox.SelLength = Len(tBox)End IfEnd Sub

How to round a number Function RoundNumber(lNumber, Optional iDecimalPlaces As Integer = 1)RoundNumber = Int(lNumber * (10 ^ iDecimalPlaces) + 0.5) / _(10 ^ iDecimalPlaces)End Function

How to place a Combo Box onto a Toolbar To put a combo box on a toolbar, create a place holder and position the 

combobox above the place holder in the z-order. You can't place the combo 

box inside the place holder. Instead, follow these steps: 

1) Create a button with the PlaceHolder style. 2) Show the form. 3) In the Form_Load event set the Top and Left properties of the combo box to the same value as the PlaceHolder button. 4) Set the z-order of the combo box to zero to bring it to the front. 5) In the Form_Resize event, make sure the Top and Left properties of thecombo box are the same as the PlaceHolder button. 

Private Sub Form_Load()Dim btnX As ButtonMe.ShowSet btnX = Toolbar1.Buttons.Add()btnX.Style = tbrSeparatorSet btnX = Toolbar1.Buttons.Add()btnX.Style = tbrPlaceholderbtnX.Key = "combo"btnX.Width = 2000With Combo1.ZOrder 0.Width = Toolbar1.Buttons("combo").Width.Top = Toolbar1.Buttons("combo").Top.Left = Toolbar1.Buttons("combo").LeftEnd WithEnd Sub

--A. Nicklas Malik

How to make an internet connection Dim resres = Shell("rundll32.exe rnaui.dll,RnaDial " _

& "connection_name", 1)

How to determine if your program is already running Put this code in the load event of the first form that the program loads.

If App.PrevInstance = True ThenCall MsgBox("This program is already running!",_vbExclamation)EndEnd If

Tip by James Limm

How to capitalize the first letter of each word in a string StrConv("my all lowercase string", vbProperCase)

Will print:'My All Lowercase String'

How to get only the file name MsgBox OnlyFileName("c:\windows\win.com","\") 'gives you 'win.com'

Function OnlyFileName(vPath$, vSlash$) As StringDim p%

OnlyFileName = vPathFor p% = Len(vPath$) To 0 Step -1If Mid$(vPath$, p%, 1) = vSlash$ ThenOnlyFileName = Mid$(vPath$, p% + 1, Len(vPath$) - p% + 1)Exit FunctionEnd IfNext p%End Function

How to use free file number when reading or writing a file Private Sub GetFile(FileName$)Dim nFilenumber%Dim tmpLine$

Text1.Text = ""nFilenumber = FreeFileOpen FileName$ For Input As #nFilenumberDo While Not EOF(nFileNumber)Input #nFileNumber, tmpLineText1.Text = Text1.Text & tmplineLoopClose #nFileNumberEnd Sub

How to reboot the system from VB Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long,ByVal dwReserved As Long) As Boolean

Public Const EWX_FORCE = 4Public Const EWX_LOGOFF = 0Public Const EWX_REBOOT = 2Public Const EWX_SHUTDOWN = 1

...Dim res As Booleanres = ExitWindowsEx (EWX_REBOOT, 0)If Not res Then MsgBox "Function failed"ElseMsgBox "Shutting down Windows NOW!"EndEndIf

How to repair Access database in VB Private Sub Command1_Click()On Error GoTo Repair_ErrorDim MDB_Name As String

CommonDialog1.Filter = "Access (*.mdb)|*.mdb"CommonDialog1.Flags = &H1000CommonDialog1.FilterIndex = 1CommonDialog1.Action = 1

If CommonDialog1.FileName <> "" ThenScreen.MousePointer = 11MDB_Name = CommonDialog1.FileNameRepairDatabase (MDB_Name)Screen.MousePointer = 0MsgBox "Database repaired successfully", 64, "Repair"End IfScreen.MousePointer = 0Exit SubRepair_Error:MsgBox "Error when repairing database", 16, "Error"Screen.MousePointer = 0Exit SubEnd Sub

How to include an '&' on a Label Since an ampersand (&) on a label will indicate an access key (with 

an underscore below to use with the Alt Key selection combination), 

you may want to have an ampersand actually appear as part of the 

text of the label.

To accomplish this, simply put two ampersands together like ... &&

How to set Tab Stops in a ListBox Want to create a simple list box that shows several fields of data 

The columns property of the list box does not do this, but you can

use this function to do it.

Public Const LB_SETTABSTOPS As Long = &H192

Public Declare Function SendMessage Lib "user32" Alias _

"SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, _

ByVal wParam As Long, lParam As Any) As Long

Public Sub DoTabs(lstListBox As ListBox, TabArray() As Long)'clear any existing tabsCall SendMessage(List1.hWnd, LB_SETTABSTOPS, 0&, ByVal 0&)'set list tabstopsCall SendMessage(List1.hWnd, LB_SETTABSTOPS, _CLng(UBound(TabArray)) + 1, TabArray(0))End SubFirst, set up the columns:

Dim Tabs(2) as LongTabs(0) = 0Tabs(1) = 100Tabs(2) = 200DoTabs List1, TabsThen, add your items:

List1.AddItem "John" & vbTab & "Percival" & vbTab & "Content Editor"List1.AddItem "James" & vbTab & "Limm" & vbTab & "Senior Editor"

Tip by John Percival

How to use the IIf function This example uses the IIf function to evaluate the TestMe parameter 

of the CheckIt procedure and returns the word "Large" if the 

amount is greater than 1000; otherwise, it returns the word "Small".

Function CheckIt (TestMe As Integer)CheckIt = IIf(TestMe > 1000, "Large", "Small")End Function

How to set the ToolTipText on a ListBox Private Sub List1_MouseMove(Button As _Integer, Shift As Integer, X As Single, Y As Single)Dim YPos As Integer, iOldFontSize As IntegeriOldFontSize = Me.Font.SizeMe.Font.Size = List1.Font.SizeYPos = Y \ Me.TextHeight("Xyz") + List1.TopIndexMe.Font.Size = iOldFontSizeIf YPos < List1.ListCount ThenList1.ToolTipText = List1.List(YPos)ElseList1.ToolTipText = ""End IfEnd Sub

How to test for weekend If (WeekDay (Date) MOD 6 = 1) then Msgbox "It's the weekend!" End if 

How to rename a file Dim OldName, NewNameOldName = "OLDFILE": NewName = "NEWFILE" ' Define file names.Name OldName As NewName ' Rename file. 

OldName = "C:\MYDIR\OLDFILE": NewName = "C:\YOURDIR\NEWFILE"Name OldName As NewName ' Move and rename file.

How to delete a directory ' Assume that MYDIR is an empty directory or folder.RmDir "MYDIR" ' Remove MYDIR.

How to delete a file Kill pathname

How to do word search Private Sub Command1_Click()

Dim X As IntegerX = FindMatch(Text1.Text, Text2.Text)If X = 0 ThenMsgBox "Word not found"ElseMsgBox "Word found"End IfEnd Sub

1. Create a new function called FindMatch. Add the following code tothis function:

Function FindMatch(Str1 As String, Str2 As String) As IntegerDim Match As IntegerDim Char1 As StringDim Char2 As String

Match = InStr(Str1, Str2)

If Match <> 0 ThenChar1 = Mid$(Str1, Match - 1, 1)If Codes(Char1) ThenChar2 = Mid$(Str1, Match + Len(Str2), 1)If Codes(Char2) ThenFindMatch = True: Exit FunctionEnd IfEnd IfEnd If

FindMatch = FalseEnd Function

2. Create a new function called Codes. Add the following code to thisfunction:

Function Codes(PuncStr As String) As IntegerIf PuncStr = "," Or PuncStr = "." Or PuncStr = " " Or _

PuncStr = Chr(10) Or PuncStr = Chr(13) Or PuncStr = Chr(9) ThenCodes = TrueElseCodes = FalseEnd IfEnd Function

How to make a form on top Declare Function SetWindowPos Lib "User" (ByVal hWnd As Integer, ByVal hWndinsertafter As Integer, ByVal x As Integer, ByVal Y As Integer, ByVal cx As Integer, ByVal cy As Integer, ByVal wFlags As Integer) As Integer

Global Const HWND_TOPMOST = -1

Global Const HWND_NOTOPMOST = -2

Sub MakeTopMost (frmForm As Form, LX%, LY%, RX%, RY%)

Dim succes As Long

succes = SetWindowPos(frmForm.hWnd, HWND_TOPMOST, LX%, LY%, RX%, RY%, 0)

End Sub

Sub UnMakeTopMost (frmForm As Form)Dim succes As Long

succes = SetWindowPos(frmForm.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, 0)

End Sub

How to reverse a string Public Function reversestring(revstr As String) As String' revstr: String to reverse' Returns: The reverse string

Dim doreverse As Long

reversestring = ""For doreverse = Len(revstr) To 1 Step -1reversestring = reversestring & Mid$(revstr, doreverse, 1)NextEnd Function

Use

Dim strResult As StringstrResult = reversestring("String")MsgBox strResult

Tip by John Percival

How to create percentage ProgressBar Sub Command1_Click () picture1.ForeColor = RGB(0, 0, 255) 'use blue bar For i = 0 To 100 Step 2 updateprogress picture1, iNext picture1.Cls 'clear bar at they endEnd Sub

Sub updateprogress (pb As Control, ByVal percent)Dim num$ 'use percentIf Not pb.AutoRedraw Then 'picture in memorypb.AutoRedraw = -1 'no, make oneEnd If pb.Cls 'clear picture in memorypb.ScaleWidth = 100 'new sclaemodus pb.DrawMode = 10 'not XOR Pen Modus num$ = Format$(percent, "###") + "%" pb.CurrentX = 50 - pb.TextWidth(num$) / 2 

pb.CurrentY = (pb.ScaleHeight - pb.TextHeight(num$)) / 2 pb.Print num$ 'print percent pb.Line (0, 0)-(percent, pb.ScaleHeight), , BFpb.Refresh 'show differentsEnd Sub

How to get rid of leading zeros in strings Function KillZeros(incoming as string) as string KillZeros = CStr(CInt(incoming)) End Function 

How to create two lines on Command Button command1.caption = "first line above" & vbCRLF & "second 

line beyond.." 

How to count lines in Rich Text Box By using the SendMessage API function and the EM_GETLINECOUNT 

message you could easily write a wrapper function that returns 

the number of lines in a multi line textbox.

Public Declare Function SendMessage _

Lib "user32" Alias "SendMessageA" ( _

ByVal hwnd As Long, _

ByVal wMsg As Long, _

ByVal wParam As Long, _

lParam As Any) As Long

Public Const EM_GETLINECOUNT = &HBA

Public Function LineCount(txtBox As TextBox) As LongLineCount = SendMessage( _TxtBox.hWnd, EM_GETLINECOUNT, 0&, 0&)End Function

How to change the color of Title Bar You can globally change any Windows 95 desktop colour using the 

SetSysColors function. It takes three parameters : The number 

of colour elements to change, The Color object constant that 

you want to change and the RGB value.

The Declaration for this API function is:

Declare Function SetSysColors Lib "user32" Alias _"SetSysColors" (ByVal nChanges As Long, lpSysColor As _Long, lpColorValues As Long) As Long 

The Constants are:

Public Const COLOR_SCROLLBAR = 0 'The Scrollbar colour Public Const COLOR_BACKGROUND = 1 'Colour of the background with no wallpaper Public Const COLOR_ACTIVECAPTION = 2 'Caption of Active Window Public Const COLOR_INACTIVECAPTION = 3 'Caption of Inactive window Public Const COLOR_MENU = 4 'Menu Public Const COLOR_WINDOW = 5 'Windows background Public Const COLOR_WINDOWFRAME = 6 'Window frame Public Const COLOR_MENUTEXT = 7 'Window Text Public Const COLOR_WINDOWTEXT = 8 '3D dark shadow (Win95) Public Const COLOR_CAPTIONTEXT = 9 'Text in window caption Public Const COLOR_ACTIVEBORDER = 10 'Border of active window Public Const COLOR_INACTIVEBORDER = 11 'Border of inactive window Public Const COLOR_APPWORKSPACE = 12 'Background of MDI desktop Public Const COLOR_HIGHLIGHT = 13 'Selected item background Public Const COLOR_HIGHLIGHTTEXT = 14 'Selected menu item Public Const COLOR_BTNFACE = 15 'Button Public Const COLOR_BTNSHADOW = 16 '3D shading of button Public Const COLOR_GRAYTEXT = 17 'Grey text, of zero if dithering is used. Public Const COLOR_BTNTEXT = 18 'Button text Public Const COLOR_INACTIVECAPTIONTEXT = 19 'Text of inactive window Public Const COLOR_BTNHIGHLIGHT = 20 '3D highlight of button 

To change the colour of the title bar, or caption, of an active 

window, you would call the function in this way:

t& = SetSysColors(1, COLOR_ACTIVECAPTION, RGB(255,0,0)) 

This example would turn the active caption red

How to shade a control Make a new project. Add a module. To the form add a text box. 

Code:Add this code to the module:

Global Const GFM_BACKSHADOW = 1Global Const GFM_DROPSHADOW = 2Public Sub ControlShadow(f As Form, C As Control, shadow_effect _

As Integer, shadow_width As Integer, shadow_color As Long) Dim shColor As Long Dim shWidth As Integer Dim oldWidth As Integer Dim oldScale As Integer shWidth = shadow_width shColor = shadow_color oldWidth = f.DrawWidth oldScale = f.ScaleMode f.ScaleMode = 3 f.DrawWidth = 1 Select Case shadow_effect 

Case GFM_DROPSHADOW f.Line (C.Left + shWidth, C.Top + shWidth)-Step(C.Width - 1, _

C.Height - 1), shColor, BF Case GFM_BACKSHADOW f.Line (C.Left - shWidth, C.Top - shWidth)-Step(C.Width - 1, _

C.Height - 1), shColor, BFEnd Selectf.DrawWidth = oldWidthf.ScaleMode = oldScaleEnd Sub

Add this code to the form's Load procedure:

Private Sub Form_Load()Dim rr=ControlShadow(me,text1,1,2,black)End Sub

How to dither a form Ever wonder how the SETUP.EXE screen gets its cool shaded background 

coloring This color shading is called dithering, and you can 

easily incorporate it into your forms. Add the following routine 

to a form: To call it, put the following statement in the 

Form_Activate event : - Dither Me 

Sub Dither(vForm As Form)

Dim intLoop As Integer

vForm.DrawStyle = vbInsideSolidvForm.DrawMode = vbCopyPenvForm.ScaleMode = vbPixelsvForm.DrawWidth = 2vForm.ScaleHeight = 256

For intLoop = 0 To 255vForm.Line (0, intLoop)-(Screen.Width, intLoop - 1), _RGB(0, 0,255 -intLoop), BNext intLoop

End Sub

How to determine free disk space Use the function GetDiskFreeSpace. The declaration for this API 

function is:

Declare Function GetDiskFreeSpace Lib "kernel32" Alias _

"GetDiskFreeSpaceA" (ByVal lpRootPathName As String, _

lpSectorsPerCluster As Long, lpBytesPerSector As Long, _

lpNumberOfFreeClusters As Long, lpTotalNumberOfClusters _

As Long) As Long

Here is an example of how to find out how much free space a drive has:

Dim SectorsPerCluster&Dim BytesPerSector&Dim NumberOfFreeClusters&Dim TotalNumberOfClusters&Dim FreeBytes&dummy& = GetDiskFreeSpace("c:\", SectorsPerCluster, _BytesPerSector, NumberOfFreeClusters, TotalNumberOfClusters)FreeBytes = NumberOfFreeClusters * SectorsPerCluster * _BytesPerSectorThe Long FreeBytes contains the number of free bytes on the drive.

Tip by James Limm

How to find out which user is logged in Dim s As StringDim cnt As LongDim dl As LongDim CurUser as Stringcnt = 199s = String$(200, 0)dl = GetUserName(s, cnt)If dl <> 0 Then curuser = Left$(s, cnt) Else curuser = ""

You must declare the following function in the declarations section 

of a form or module in the project.

Declare Function GetUserName Lib "advapi32.dll" Alias _

"GetUserNameA" (ByVal lpBuffer As String, nSize As Long) _

As Long

Tip by James Limm

How to detect if the system has a sound card Add the following code to the declarations section of the project.

Declare Function waveOutGetNumDevs Lib "winmm.dll" _

Alias "waveOutGetNumDevs" () As Long

Dim i As Integeri = waveOutGetNumDevs()If i > 0 Then MsgBox "Your system can play sound files.", _vbInformation, "Sound Card Test" Else MsgBox "Your system can not play sound Files.", _vbInformation, "Sound Card Test" End If

Tip by James Limm

How to disable Ctrl-Alt-Delete and Ctrl-Esc Copy this code into the declarations section of your project.

Private Declare Function SystemParametersInfo Lib _

"user32" Alias "SystemParametersInfoA" (ByVal uAction _

As Long, ByVal uParam As Long, ByVal lpvParam As Any, _

ByVal fuWinIni As Long) As Long

Code

Sub DisableCtrlAltDelete(bDisabled As Boolean)Dim X As LongX = SystemParametersInfo(97, bDisabled, CStr(1), 0)End Sub

Use

To disable Ctrl-Alt-Delete:

Call DisableCtrlAltDelete(True)To enable Ctrl-Alt-Delete:

Call DisableCtrlAltDelete(False)

Tip by James Limm

How to make the title bar flash Create a new .exe project, add a module to it with the following code:

Public Declare Function FlashWindow _

Lib "user32" (ByVal hwnd As Long, _

ByVal bInvert As Long) As Long

Put a timer and 2 commandbuttons on form1 with these properties:

command1.caption="Start"command2.caption="Stop"timer1.interval=500 'flashes every 1/2 secondtimer1.enabled=false

Code

Private Sub Timer1_Timer()a& = FlashWindow(Me.hwnd, 1)End Sub

Private Sub Command1_Click()Timer1.Enabled = TrueEnd Sub

Private Sub Command2_Click()Timer1.Enabled = FalseEnd SubExecute the app. (F5) and click the buttons.

Tip by Gijs de Jong

How to get the file size This is an easy way to get the file size of any file a user might 

select. Lets assume you have a form with a directory list box 

called mydir and a file list box named myfile. The user can scroll

to any directory on their hard drive, select a file from the file 

list box and the program will tell them the size of that file. 

Heres the code:

Private Sub cmdShowFileSize_Click()Dim strOldFile As StringDim strOldSize As StringDim strMyDir As StringDim strMyFile As String

'Update the following with your directory and file'info or use App.Path. This sample does not include

'error checking.

strMyDir = "c:\windows\desktop"strMyFile = "readme.txt"

strOldFile = strMyDir & "\" & strMyFilestrOldSize = FileLen(strOldFile)

lblFileSize.Caption = "The file " & strOldFile & " is " & _Format(strOldSize, "#,##0") & " bytes in size."

End Sub

How to use an isEven Function This function returns True if the number is even or False if it's odd: 

Function isEven(n As Integer) As Boolean isEven = True If n And 1 Then isEven = False End Function 

How to roll a Form up and down Sub RollFormUp(frm As Form, up As Integer)

'Rolls a form up. Pay attention to the form's scalemode'property. If it's set to pixels and you use a twip value,'for example, your form will roll during an eternity!'up - the amount you want the form to be rolled up

'It can be used as a splash window

Dim UntilCond

UntilCond = frm.Height - upIf UntilCond <= 0 Then Exit SubIf up < 0 Then Exit Sub

Dofrm.Height = frm.Height - 1DoEventsLoop Until frm.Height <= UntilCond

End Sub

Sub RollFormDown(frm As Form, down As Integer)

'Rolls a form down. Again, pay attention to the scalemode!'down is the amount you may want your form to be rolled down

Dim UntilCond

UntilCond = frm.Height + down

If down < 0 Then Exit Sub

Dofrm.Height = frm.Height + 1DoEventsLoop Until frm.Height >= UntilCond

End Sub

Private Sub Command1_Click()Call RollFormDown(Form1, 100)End Sub

How to swap two interger variables Use the following algorithm to swap two interger variables:

a = a Xor bb = a Xor ba = a Xor b

How to connect Lists boxes to Access database On Error GoTo process_err

' Now lets put the names into the Listbox.YourRS.MoveLastX = YourRS.RecordCountYourRS.MoveFirst

DoList1.AddItem YourRS!yourfieldY = Y + 1: YourRS.MoveNextLoop Until Y = X ' X = last record remember.process_err:Select Case (Err)Case 3021 ' No current recordrecord_count = 0Exit SubList1.RefreshEnd Select

How to order records in a RecordSet by a field ' This orders all records in YourRS by YourField from Z-A.' If you want it in A-Z order, just replace DESC with ASC.

Set YourRS = YourDB.OpenRecordset("SELECT YourField.* FROM _

YourField " & "ORDER BY AnotherField DESC;")

How to add a file to Windows 95 documents list Place this code in a module: 

Declare Sub SHAddToRecentDocs Lib "shell32.dll" (ByVal uFlags As Long, 

ByVal pv As String)

Code: 

Dim NewFile as StringNewFile="c:\mydir\myfile.txt"SHAddToRecentDocs(2,NewFile)

How to clear Windows 95 documents list Place this code in a module: Declare Sub SHAddToRecentDocs Lib "shell32.dll" (ByVal uFlags As Long, 

ByVal pv As String)

Code: 

SHAddToRecentDocs(2,vbNullString)

How to get screen resolution ' Get the resolution.sHeight = Screen.Height \ Screen.TwipsPerPixelYsWidth = Screen.Width \ Screen.TwipsPerPixelX

' A message box.s = MsgBox("Your screen resolution is: " & sWidth & " x " & sHeight, , 

"Screen Resolution")

How to print a picture Printer.PaintPicture Picture1.PicturePrinter.EndDoc

How to cancel a print job 'This following also shows how to print out the multiple documents

Printer.Print "Page 1"Printer.NewpagePrinter.Print "Page 2"Printer.KillDoc

How to detect keypress outside your program Place this code in a module 

Declare Function GetAsyncKeyState Lib "user32" 

(ByVal vKey As Long) As Integer

' This is the constant for the TAB key. 

' Use the API Text Viewer to find the key you want to use.Public Const VK_TAB = &H9

Place this code in Timer1_Timer() 

If GetAsyncKeyState(VK_TAB) Then' Beep if TAB-key is pressedBeepEnd If

How to hide the mouse pointer Place this code in a module. 

Declare Function ShowCursor Lib "user32" (ByVal bShow 

As Long) As Long

This code will hide the mouse pointer 

mypointer = ShowCursor(False)

This code will show the mouse pointer 

mypointer = ShowCursor(True)

How to get the length of a string Dim i As Longi = Len(sYOURSTRING)

How to copy an image from one Picture Box to another Picture Box using the Clipboard Place this Command1_Click() 

' Clear the Clipboard if it's another type of data in the Clipboard.Clipboard.ClearClipboard.SetData Picture1.Picture

Place this Command2_Click() 

' Copy Clipboard text to Text2.Picture2.Picture = Clipboard.GetData

How to center a Picture Box on a form Picture1.Left = (Form1.Width - Picture1.Width) / 2 

How to fill a form with confetti DrawWidth = 5 ' Width of the dots

Dim x As LongDim y As Long

Dim r As IntegerDim g As IntegerDim b As Integer

Randomize

Dox = Val(Screen.Width) * Rndy = Val(Screen.Height) * Rnd

'A random color to next dot.r = 255 * Rnd

g = 255 * Rndb = 255 * Rnd

Form1.PSet (x, y), RGB(r, g, b)Loop

How to remove a picture to a Picturebox at run time Picture1.Picture = LoadPicture("")

How to add a picture to a Picturebox at run time Picture1.Picture = LoadPicture("c:\yourpicture.bmp")

How to count how many rows there are in a listview lItemCount = lstCount.ListItems.Count msgbox lItemCount

How to select all items in a listbox Place this code in cmdAddNew_Click() 

List1.AddItem Text1.Text ' Add new itemPlace this code in cmdSelectAll_Click() 

For x = 0 To List1.ListCount - 1 ' Loop all itemsList1.Selected(x) = True ' Select item(x)Next x

How to disable the Text Box beep Private Sub Text1_KeyPress(KeyAscii As Integer) KeyAscii = 0End Sub

How to make only lowercase letters in a textbox oldpos = Text1.SelStartText1.Text = LCase(Text1.Text) 'use 'UCase' if you want uppercaseText1.SelStart = oldpos

How to create separator in the menus mnu.Caption="-"

How to add a new line to existing textbox text Dim strNewText As StringWith Text1strNewText = "Updated: " & Date.SelStart = Len(.Text).SelText = vbNewLine & strNewTextEnd With

How to use the advanced feature of Message Box Dim Msg, Style, Title, Help, Ctxt, Response, MyStringMsg = "Do you want to continue " ' Define message.Style = vbYesNo + vbCritical + vbDefaultButton2 ' Define buttons.Title = "MsgBox Demonstration" ' Define title.Help = "DEMO.HLP" ' Define Help file.Ctxt = 1000 ' Define topic' context.

' Display message.Response = MsgBox(Msg, Style, Title, Help, Ctxt)If Response = vbYes Then ' User chose Yes.MsgBox "You click 'Yes'" ' Perform some action.Else ' User chose No.MsgBox "You click 'No'" ' Perform some action.End If

How to show your own Popup menu in the text box Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)If Button = 2 ThenWith Text1.Enabled = FalsePopupMenu {YourMenu}.Enabled = True.SetFocusEnd WithEnd IfEnd Sub

How to make form controls to be movable (DRAG AND DROP) This is a tip on how to make controls movable on a form. This example demonstrates a movable picture box.

Option ExplicitPublic globalX As IntegerPublic globalY As Integer

Private Sub Form_DragDrop(Source As Control, X As _Single, Y As Single)Picture1.Move X - globalX, Y - globalYEnd Sub

Private Sub Picture1_MouseDown(Button As Integer, _Shift As Integer, X As Single, Y As Single)Picture1.Drag vbBeginDragglobalX = XglobalY = YEnd Sub

How to unload all the Forms to free memory Public Sub UnloadAllForms()Dim Form As FormFor Each Form In FormsUnload FormSet Form = NothingNext FormEnd SubIt is best to call this procedure from the unload event of 

your main form.

How to launch Windows Control Panel extensions using VB Option Explicit

Private strPanelName As String

Private Sub Command1_Click()strPanelName = File1.filenameIf strPanelName = "" ThenMsgBox "A .CPL file was not selected." & vbCrLf & _"The Windows Control Panel will be opened.",vbInformationEnd IfShell "rundll32.exe shell32.dll,Control_RunDLL " & _ strPanelName, vbNormalFocusEnd Sub

Private Sub Form_Load()With File1'Display Control Panel Extension files only:.Pattern = "*.CPL"'Point the FileListBox to the System or System32 dir:.filename = "C:\Windows\System"End WithEnd Sub

How to load a text file in one operation Function FileText (filename$) As StringDim handle As Integerhandle = FreeFileOpen filename$ For Input As #handleFileText = Input$(LOF(handle), handle)Close #handleEnd Function

Text1.Text = FileText("c:\autoexec.bat")

How to suppress spaces in a TextBox To prevent users from typing spaces in a text box, include this 

code in the KeyPress event of the text box:

Private Sub Text1_KeyPress(KeyAscii As Integer)If KeyAscii = 32 ThenKeyAscii = 0End IfEnd Sub

-Meena Swaminathan, received by e-mail

How to speed up database access Here is a trick to loop through a recordset faster. Often when looping through a recordset people will use the following code:

Do While Not Records.EOFCombo1.AddItem Records![Full Name]Eecords.MovenextLoopThe problem is that everytime the database moves to the next record it must make a check to see if it has reached the end of the file. This slows the looping down a great deal. When moving or searching throuch a large record 

set this can make a major difference. Here is a better way to do it.

Records.MoveLastintRecCount=Records.RecordCountRecords.MoveFirst

For intCounter=1 To intRecCountCombo1.AddItem Records![Full Name]Records.MoveNextNext intCounterYou should see about a 33% speed increase.

Tip by Levi Page

How to Create Rainbow Text 1. Start a new Standard Exe project; form1 is created by default

2. Type in the following code.

Sub Form_Paint()Dim I As Integer, X As Integer, Y As IntegerDim C As StringClsFor I = 0 To 91X = CurrentXY = CurrentYC = Chr(I)'Line -(X + TextWidth(C), Y = TextHeight(C)), _QBColor(Rnd * 16), BFCurrentX = XCurrentY = YForeColor = RGB(Rnd * 256, Rnd * 256, Rnd * 256)Print "Hello World Hello World Hello World Hello"NextEnd Sub3. Run the program by pressing F5 or choosing start from the run programand watch the form fill with lots of multi-coloured text

Tip by Steve Anderson

How to Add frequently used modules to the templates directory If you have modules or class modules that you use all the time in many of your projects, you can add them to the Templates directory. It is usually located in the VB directory (often C:\Program Files\DevStudio\VB) and is called Template. Under the Template directory you will find several directories that correspond to the types of files you can add, such as Classes. Just copy your source code files to the appropriate directory and go try to add the file to the project. Your files will appear under the New Tab.

How to retrieve the screen resolution It is often very useful to be able to resize your Visual Basic program depending on what the screen resolution is. In this tip, we will explain how to find the resolution.

ResWidth = Screen.Width \ Screen.TwipsPerPixelX

ResHeight = Screen.Height \ Screen.TwipsPerPixelYScreenRes = ResWidth & "x" & ResHeightResWidth will be set to the resolution of the width on the screen, and ResHeight will be set to the resolution of the height of the screen. 

ScreenRes will be set to something similar to:

800x600

Tip by James Limm

How to scroll caption on the form's title bar Sub TitleScroll(frm As Form)Dim X As IntegerDim current As VariantDim Y As StringY = frm.Captionfrm.Caption = ""frm.ShowFor X = 0 To Len(Y)If X = 0 Thenfrm.Caption = ""current = TimerDo While Timer - current < 0.1DoEventsLoopGoTo doneElse: End Iffrm.Caption = left(Y, X)current = TimerDo While Timer - current < 0.05DoEventsLoopdone:Next XEnd Sub

How to hide mouse cursorYou can use the API function Showcursor to control the visibility of the mouse cursor. To use this tip, paste this declaration into a module. The Parameter lShow show be set to True (non-zero) to display the cursor, False to hide it.

Public Declare Function ShowCursor& Lib "user32" (ByVal lShow As Long) 

How to check if the credit card is validAdd this function to a .BAS or a form and to check whether a creditcard number is valid, call it using something like:Valid = IsValidCreditCardNumber("4552012301230123"). Valid will then contain true or false depending on what number was passed to the function.

Public Function IsValidCreditCardNumber(ByVal pCardNumber As String) As BooleanDim CharPos As IntegerDim CheckSum As IntegerDim tChar As String

For CharPos = Len(pCardNumber) To 2 Step -2CheckSum = CheckSum + CInt(Mid(pCardNumber, CharPos, 1))tChar = CStr((Mid(pCardNumber, CharPos - 1, 1)) * 2)CheckSum = CheckSum + CInt(Left(tChar, 1))

If Len(tChar) > 1 Then CheckSum = CheckSum + CInt(Right(tChar, 1))Next

If Len(pCardNumber) Mod 2 = 1 Then CheckSum = CheckSum + CInt(Left(pCardNumber, 1))

If CheckSum Mod 10 = 0 ThenIsValidCreditCardNumber = TrueElseIsValidCreditCardNumber = FalseEnd If

End Function

How to check what the last day of a month isPublic Function LastDayOfMonth(ByVal ValidDate As Date) As ByteDim LastDay As Byte

LastDay = DatePart("d", DateAdd("d", -1, DateAdd("m", 1, _DateAdd("d", -DatePart("d", ValidDate) + 1, Date))))

LastDayOfMonth = LastDayEnd Function

Private Sub Command1_Click()

MsgBox "The last day of the month with date " & Date & _" is " & LastDayOfMonth(Date)

End Sub

How to open VB 6 file with VB 5You need first use notepad to open the VB 6 .vbp file. In VB 6 .vbp

file, find 'Retained = 0' statement, delete it, and save the file. 

Now you can open VB 6 file without error message. 

How to deal with Null strings in Access database fieldsBy default Access string fields contain NULL values unless a string value 

(including a blank string like "") has been assigned. When you read these fields using recordsets into VB string variables, you get a runtime type-mismatch error. The best way to deal with this problem is to use the built-in & operator to concatenate a blank string to each field as you read it. For example:

Dim DB As DatabaseDim RS As RecordsetDim sName As String 

Set DB = OpenDatabase("Test.mdb")Set RS = DB.OpenRecordset("Name")sName = "" & RS![Last Name]

How to make a form fade to black Sub FormFade(frm As Form)' Makes Form Fade To Black' Example: FormFade(Form1)For icolVal% = 255 To 0 Step -1DoEventsfrm.BackColor = RGB(icolVal%, icolVal%, icolVal%)Next icolVal%End Sub

How do you make a form appear in center while executing? In the form properties, the startup position property is having two option regarding Center the form. (1) Center Owner: The form will be made centered based on the current form that calls the form i.e. if already one form is opened then the next form will be the center to that form which will be called. (2) Center Screen: I hope no need of any explanation for this. Sample code is:Private Sub Form_Load()Form1.Top = (Screen.Height - Form1.Height) / 2Form1.Left = (Screen.Width - Form1.Width) / 2End Sub 

Convert an RGB value to a long.LongVar = BlueValue * 65536 + GreenValue * 256 + redValue

Convert a Long value to RGB.RedValue = LongValue Mod 256GreenValue = ((LongValue And &HFF00) / 256&) Mod 256&BlueValue = (LongValue And &HFF0000) / 65536

How do I create multi-column combo box? VB doesn’t have multicolums prperty for a combobox,but we can create a custome control using(textbox, command button and any grid). 

How can I call a Command button without clicking it? Just call the CommandButton1_Click event from anywhere. 

What are types of ActiveX Components in VB?ActiveX DLL, ActiveX Exe, ActiveX Controls, ActiveX Document DLL, ActiveX Document Exe

Advantage & differences of ActiveX DLL over ActiveX Exe .Advantages:-DLL is faster WRT exe, because DLL runs within the same process space of its clientwhere as exe runs on its own process space.Difference :-DLL is faster than exe and DLL is in-process whereas exe is out-process