VB Dot Net Notes (Developing)

VB .NET 2008

VB DOT NET SYLLABUS 30 Hours

CLASS: 1 (THEORY) 1 Introduction to Dot Net2 VB Dot Net Project Type3 Features of VB Dot Net4 Introduction to Console Based project5 If condition6 For Loop7 For Each Loop8 Select Case9 Goto Statement

CLASS: 2 (THEORY) 10Standard Array11Dynamic Array12Date & Time Function13String Function14Math Function15Conversion Function

CLASS: 3 (THEORY) 16Exception handling 17Enumeration18Structure19Throw Exception20Multithreading

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VB .NET 2008

CLASS: 4 (THEORY) 21Class and Object22Constructor23Finalize24Method Overloading25Method Overriding26Abstraction27Dispose method28 Inheritance 29 Interface method

CLASS: 5 (THEORY) 30 Introduction to Window Form Application31Access Control32Add Control33Dialog Control34 Input box35Message box36Visible True and False Enable True and False 37Window Presentation Foundation38Keyboard Events & Mouse Events

CLASS: 6 (THEORY) 39Label40Button41Textbox42Picture Box43Progress Bar44Rich Text Box45Check Box46Radio Button47Timer 48Date Time Picker

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VB .NET 2008

49Mask Text Box50Table Layout Panel51Notify Icon

CLASS: 7 (THEORY)

52Month Calendar53Link Label54Group Box55Combo Box56List Box57Numeric Up down

CLASS: 8 (THEORY) 58List View59Checked List Box60Tool Strip61Tree View62Web Browser63Status Strip64Tab Control

CLASS: 9 (THEORY) 65Flow Layout 66Panel67Spilt Container68Data Set69Data Grid View70Binding Source71Binding Navigator

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VB .NET 2008

CLASS: 10 (THEORY) 72Menu Strip73Tool Tip74Tool Strip75Status Strip76Context Menu Strip77Tool Strip Container78Open Dialogue

CLASS: 11 (THEORY) 79Folder Browser Dialogue80Font Dialogue81Color Dialogue82Save File Dialogue

CLASS: 12 (THEORY) 83Page Setup Dialogue84Print Dialogue85Print Document86Print View Control87Print View Dialogue

CLASS: 13 (THEORY)

88 Image List89Error Provider90TrackBar91Windows Media Player

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VB .NET 2008

CLASS: 14 (THEORY) 92My Computer Object 93My User Object

CLASS: 15 (THEORY) 94Advanced Concept in Vb.Net95 (Cryptography) Public Key Encryption96 (Cryptography) Secret Key File97File Input and Output98 File Access Lib99 File Access Application

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VB .NET 2008

DOT NET

Dot Net Framework:

A framework is in which windows application may be developed and run the Dot NetWork based on Dot Net Frame work.

E.g. Frame work 2.0, 2.5, 3.0, 3.5

Using Front End software:

Four types of Dot Net:

1) Visual Basic Dot Net

2) C Sharp Dot Net

3) Asp Dot Net

4) C++ Dot Net

Here ADO is not software

It is data connection concept

Using Back End software:

1) SQL Server

2) Oracle

3) Ms Access

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VB .NET 2008

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.NE

T FRA

ME

WO

RK

2.0 &SP1

OPERATING SYSTEM HARDWARE

VISU

AL ST

UD

IO .N

ET

COMMON LANGUAGE RUNTIME (CLR)

. NET FRAME WORK BASE CLASS LIBRARY

WINDOWS

FORMS

ASP. NET CONSOLE

FORMS

ADO. NET

. NET FRAME WORK CLASS LIBRARY

COMMON TYPE SYSTEM

COMMON LANGUAGE SPECIFICATION

C# VB. NET VISUAL C++

OTHER. NET LANGUAGE

.NE

T FRA

ME

W

OR

K 3.0 &

SP1.N

ET FR

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WO

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3.5

LINQ ASP. NET 3.5

ADO .NET ENTITY

FRAME WORK & DATA

SERVICES

ADDITIONAL ENHANCEMENTS

WINDOWS PRESENTATION FOUNDATION

(WPF)

WINDOWS COMMUNICATION

FOUNDATION (WCF)

WINDOWS WORK FLOWS FOUNDATION

(WFF)

WINDOWS CARD SPACES (WCF)

VB .NET 2008

VISUAL DOT NET-2008

INTRODUCTION:

VB Dot Net is based on GUI

VB Dot Net is Not a case sensitive

VB Dot Net is also pure OOPs

VB Dot Net is creating distributed applications

IDE provides with a centralized location for designing the user interface for the application, writing code & Compile & Debugging the applicationWay to Open Dot Net:

Start All programs Microsoft Visual Studio 2008 Microsoft Visual Studio 2008 Click

VB Dot Based on Two types of Application:

1) Based on Console Application

2) Based on Windows Application

Way to Open New Console Project:

File New Project (Ctrl+Shift+N) Click

Project TypeVisual Basic WindowsConsole Application File name pathOk

Way to Open New Windows Project:

File New Project (Ctrl+Shift+N) Click

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VB .NET 2008

Project TypeVisual Basic WindowsWindows Form Application File name pathOk

VB DOT NET Shortcut Key:

Meaning Shortcut key

New Project Ctrl+Shift+N

Server Explorer Ctrl+Alt+S

Toolbox Explorer Ctrl+Alt+X

Solution Explorer Ctrl+Alt+L

Properties F4

Run F5

Visual Basic Project Type Meaning

Console Application Created Console Application

Windows Application Created Windows Application

Class Library Create a reusable code library(*.dll files)

Empty Project Import existing files into a new project

Variable Declaration:

Dim <Access Specifies> <Variable name> as <Data type>

Eg:

Dim a as string

Data types:

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VB .NET 2008

String, Object, Date, Integer, Byte, Boolean, Single, Short, Char, Double, Long

Access Specifies:

Friend, Private, Public, WithEvents, ReadOnly

Difference between C & Java & VB Dot Net:

Format C Java VB Dot Net

Print message Printf System.out.println() System.console.writeline()

Get message Scanf d.readline() System.console.readline()

String Double code Double code Double code

Character Singe code Singel code Double code

Extension <file name>.c <file name>.java <file name>.vbp

Directives Header files Packages Name spaces

Using Namespace:

Syntax for using Namespace:

Imports <Name space>

Comment Line:

Syntax for Comment Line:

‘<Comment line>

Or

Rem <Comment line<String & Character:

Front and Back double code Eg: “Hello” Eg: “c”THANKING YOU


VB .NET 2008

Windows Projects

CLASS: 5 (THEORY)

Project: 1

‘Eg for Access Control

Form Design:

‘

Form Coding:Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click MsgBox("ALT+C shortcut key") End SubEnd Class

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VB .NET 2008

Legends:Button1.text=& Click me

Project: 2

‘E.g. for Add Control

Form Design:

‘

Form Coding:

Public Class Form1

Private Sub Form1_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated Dim b1 As Button = New Button() b1.Name = "b1" b1.Size = New Size(150, 20) b1.Location = New Point(100, 100) b1.Text = "Hello World of Coding" Controls.Add(b1) End SubEnd Class

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VB .NET 2008

Legends:

Project: 3

‘E.g. for Input box and Msgbox

Form Design:

‘


Dim a, b As Integer Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

a = InputBox("Enter the a value:") b = InputBox("Enter the b value:") MsgBox("value is:" & a + b)

End Sub

End Class

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VB .NET 2008

Button1.text=Addition

Button1.font=Choose any font name with size

Button1.backcolor= choose any color

Form1.backcolor=choose any color

Project: 4

‘E.g. for Enable true and false & Visible true and false

Form Design:

Form Coding:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click MonthCalendar1.Enabled = True End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click MonthCalendar1.Enabled = False End Sub Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click MonthCalendar1.Visible = False End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click MonthCalendar1.Visible = True End SubEnd Class

Legends:

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VB .NET 2008

Button1.text=ENABLE TRUE

Button2.text=ENABLE FALSE

Button3.text=VISIBLE TRUE

Button4.text=VISIBLE FALSE

Project: 5

‘E.g. for Mouse Events

Form Design:

Form Coding:Public Class Form1 Private Sub Form1_MouseDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDoubleClick MsgBox("Mouse double click")

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VB .NET 2008

End Sub

Private Sub Form1_MouseWheel(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseWheel MsgBox("mouse wheel scrolled") End Sub

End Class

Project: 5

‘E.g. for Keyboard Events

Form Design:

Form Coding:Public Class Form1 Dim i Dim s As String() = New String() {"i", " ", "a", "m", " ", "l", "o", "o", "s", "e", " "} Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick For i = 0 To 10 Step 1 RichTextBox1.Text = RichTextBox1.Text & s(i) Next End SubEnd Class

Legends:Timer1.Interval=1000Timer1.Enabled =true

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VB .NET 2008

RichTextbox1.text=””Form1.text=My Text EditorForm1.icon= Choose any icon

To prepare complete Software:Go to Build Menu Publish Click Choose any Location Next Next Finish

CLASS: 6 (THEORY)

Project: 1

‘Eg for Label, Button, Picture box, Group box, Textbox, Radio button FORM DESIGN:

Legends:Form1.startup=Center Screen

Label1.text=Enter the Username:

Label2.text=Enter the Password:

Textbox1.PasswordChar=*

Button1.text=Login???

Picturebox1.Picture=choose any picture

Image1.Size mode=Stretch mode

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VB .NET 2008

Group box1.text=select your option

Option1.text=Image1

Option2.text=Image2

Option3.text=Image3

Option4.text=Image4


Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load PictureBox1.Visible = False GroupBox1.Visible = False End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If TextBox1.Text = "karthi" AndAlso TextBox2.Text = "bss" Then MsgBox("login success") PictureBox1.Visible = True GroupBox1.Visible = True Else MsgBox("Login Error") TextBox1.Focus() End If End Sub

Private Sub RadioButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton1.CheckedChanged PictureBox1.Image = Windows_1.My.Resources.Resources.image1 End Sub



Private Sub RadioButton4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton4.CheckedChanged PictureBox1.Image = Windows_1.My.Resources.Resources.image4 End SubEnd Class

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VB .NET 2008

Project 2:

‘EG Progress bar, Timer Control

Form Design:

LEGENDS:

Timer1.Enabled=true

Timer1.interval=100

Form1.text=Please Wait..

Label1.Text=Loading..

Form1.Controlbox=false

Form1.startup=Center Screen


Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick On Error GoTo a

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VB .NET 2008

ProgressBar1.Value = ProgressBar1.Value + 1 Label1.Text = "Loading" & ProgressBar1.Value & "%" If ProgressBar1.Value = 100 Then MsgBox("Loading completed..") Timer1.Enabled = False End Ifa: End Sub

End Class

Project 3:

‘Eg for List box, Notify icon, Check box, Option button, Mask Textbox

Form Design:

LEGENDS:

Form1.text=Application Form Filling..


Form Coding:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click ListBox1.Items.Add("NAME:" & TextBox1.Text)

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VB .NET 2008

ListBox1.Items.Add("ADDRESS:" & RichTextBox1.Text) ListBox1.Items.Add("DOJ:" & DateTimePicker1.Value) ListBox1.Items.Add("CELL NO:" & MaskedTextBox1.Text) End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load NotifyIcon1.Visible = True End SubEnd Class

Project 4:

‘Eg for Application Developing

Form Design:

LEGENDS:

Timer1.interval=100

Timer1.enabled=true

Textbox1, 2, 3, 4, 5.Enabled =false

Form1.maximum=false

Form1.minimum=false

Form1.text=BUS MONITORING

Form1.starup=center screen

Form Coding:

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VB .NET 2008

Public Class Form1

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick Label1.Text = "DATE:" & DateValue(Now) Label2.Text = "TIME:" & TimeValue(Now) End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load TextBox1.Text = "1" TextBox2.Text = "MTC" TextBox3.Text = TimeOfDay TextBox4.Text = "CMBT" TextBox5.Text = "PARRYS" End Sub

End Class

Project 5:

‘Eg for Calculator preparation

Form Design:

LEGENDS:

Form1.text=Calculator..

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VB .NET 2008


Form1.Minimize =False

Form1.Maximum =False

Form1.Icon=choose any icon

Table layout Panel1.column=4

Table layout panel1.Row=5

Table layout panel1.Cell Border Style= outset double

Table layout panel1.Cursor= Hand

Textbox1.Enabled=false

Form Coding:Public Class Form1 Dim curval, preval, result, choice Public Sub disp() Button1.Enabled = False Button2.Enabled = False Button3.Enabled = False Button4.Enabled = False Button5.Enabled = False Button6.Enabled = False Button7.Enabled = False Button8.Enabled = False Button9.Enabled = False Button10.Enabled = False Button11.Enabled = False Button12.Enabled = False Button13.Enabled = False Button14.Enabled = False Button15.Enabled = False Button16.Enabled = False Button17.Enabled = False Button18.Enabled = False Button19.Enabled = True Button20.Enabled = False End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Call disp() End Sub

Private Sub Button19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button19.Click Button1.Enabled = True

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VB .NET 2008

Button2.Enabled = True Button3.Enabled = True Button4.Enabled = True Button5.Enabled = True Button6.Enabled = True Button7.Enabled = True Button8.Enabled = True Button9.Enabled = True Button10.Enabled = True Button11.Enabled = True Button12.Enabled = True Button13.Enabled = True Button14.Enabled = True Button15.Enabled = True Button16.Enabled = True Button17.Enabled = True Button18.Enabled = True Button19.Enabled = False Button20.Enabled = True End Sub

Private Sub Button20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button20.Click Call disp()

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox1.Text = TextBox1.Text & Button1.Text curval = Val(TextBox1.Text) End Sub




Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click TextBox1.Text = TextBox1.Text & Button5.Text

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VB .NET 2008

curval = Val(TextBox1.Text) End Sub







Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click curval = preval = result = 0 TextBox1.Text = "" End Sub

Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click TextBox1.Text = "" preval = curval curval = 0 choice = "+" End Sub

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VB .NET 2008

Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click TextBox1.Text = "" preval = curval curval = 0 choice = "-" End Sub

Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click TextBox1.Text = "" preval = curval curval = 0 choice = "*" End Sub

Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click TextBox1.Text = "" preval = curval curval = 0 choice = "/" End Sub

Private Sub Button18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button18.Click Select Case choice Case "+" result = preval + curval TextBox1.Text = CStr(result) Case "-" result = preval - curval TextBox1.Text = CStr(result) Case "*" result = preval * curval TextBox1.Text = CStr(result) Case "/" result = preval / curval TextBox1.Text = CStr(result) curval = Val(result) End Select End Sub

Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click curval = -curval TextBox1.Text = Str(curval) End SubEnd Class

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VB .NET 2008

CLASS: 7

FORM DESIGN:

Form Coding:

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VB .NET 2008

Project: 2

Form Design:

‘Eg for Link label

Legends:

Form Coding:Public Class Form1 Private Sub GroupBox3_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GroupBox3.Enter End Sub Private Sub GroupBox2_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GroupBox2.Enter

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VB .NET 2008

End Sub Private Sub LinkLabel9_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel9.LinkClicked System.Diagnostics.Process.Start("sqlplus") End Sub Private Sub LinkLabel3_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel3.LinkClicked System.Diagnostics.Process.Start("Wordpad") End Sub Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked System.Diagnostics.Process.Start("notepad") End Sub Private Sub LinkLabel4_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel4.LinkClicked System.Diagnostics.Process.Start("cmd") End Sub Private Sub LinkLabel2_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel2.LinkClicked System.Diagnostics.Process.Start("mspaint") End Sub Private Sub LinkLabel5_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel5.LinkClicked System.Diagnostics.Process.Start("winword") End Sub Private Sub LinkLabel6_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel6.LinkClicked System.Diagnostics.Process.Start("excel") End Sub Private Sub LinkLabel7_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel7.LinkClicked System.Diagnostics.Process.Start("powerpnt") End Sub Private Sub LinkLabel8_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel8.LinkClicked System.Diagnostics.Process.Start("msaccess") End Sub Private Sub LinkLabel10_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel10.LinkClicked System.Diagnostics.Process.Start("Photoshop") End Sub Private Sub LinkLabel11_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel11.LinkClicked

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VB .NET 2008

System.Diagnostics.Process.Start("Iexplore") End Sub

Private Sub LinkLabel12_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel12.LinkClicked System.Diagnostics.Process.Start("Nero") End SubEnd Class

Project: 3 ‘Eg for Combo box, Numeric Up down

Form Design:

Form Coding:Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ComboBox1.Items.Add("PANDIAN") ComboBox1.Items.Add("ROCK FORT") ComboBox1.Items.Add("MUMBAI ") ComboBox1.Items.Add("SALEM") ComboBox1.Items.Add("VAIGAI") End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged If ComboBox1.SelectedIndex = 0 And NumericUpDown1.Value = 1 Then TextBox1.Text = "10.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "MADURAI" End If If ComboBox1.SelectedIndex = 1 And NumericUpDown1.Value = 2 Then TextBox1.Text = "12.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "THANJAVUR" End If If ComboBox1.SelectedIndex = 2 And NumericUpDown1.Value = 3 Then TextBox1.Text = "16.30" TextBox2.Text = "CHENNAI" TextBox3.Text = "MUMBAI" End If

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VB .NET 2008

If ComboBox1.SelectedIndex = 3 And NumericUpDown1.Value = 4 Then TextBox1.Text = "18.10" TextBox2.Text = "CHENNAI" TextBox3.Text = "SALEM" End If If ComboBox1.SelectedIndex = 4 And NumericUpDown1.Value = 5 Then TextBox1.Text = "21.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "GINGEE" End If End SubEnd Class

Project: 4

‘System Terminator software creation

Form Design:

Form Coding:Public Class Form1 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick TextBox2.Text = TimeValue(Now) End Sub Private Sub RadioButton4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RadioButton4.CheckedChanged System.Diagnostics.Process.Start("cmd") End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ComboBox1.Items.Add("ON")

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VB .NET 2008

ComboBox1.Items.Add("OFF") End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged If ComboBox1.SelectedIndex = 0 And RadioButton1.Checked = True Then If TextBox1.Text = TimeValue(Now) Then MsgBox("ok") System.Diagnostics.Process.Start("Logoff") End If End If End SubEnd Class

Project: 5 ‘Eg for CheckListbox

Form Design:

Form Coding:Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ComboBox1.Items.Add("PANDIAN") ComboBox1.Items.Add("ROCK FORT") ComboBox1.Items.Add("MUMBAI ") ComboBox1.Items.Add("SALEM") ComboBox1.Items.Add("VAIGAI") End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged If ComboBox1.SelectedIndex = 0 And NumericUpDown1.Value = 1 Then TextBox1.Text = "10.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "MADURAI" End If If ComboBox1.SelectedIndex = 1 And NumericUpDown1.Value = 2 Then TextBox1.Text = "12.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "THANJAVUR" End If If ComboBox1.SelectedIndex = 2 And NumericUpDown1.Value = 3 Then TextBox1.Text = "16.30" TextBox2.Text = "CHENNAI" TextBox3.Text = "MUMBAI"

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VB .NET 2008

End If If ComboBox1.SelectedIndex = 3 And NumericUpDown1.Value = 4 Then TextBox1.Text = "18.10" TextBox2.Text = "CHENNAI" TextBox3.Text = "SALEM" End If If ComboBox1.SelectedIndex = 4 And NumericUpDown1.Value = 5 Then TextBox1.Text = "21.50" TextBox2.Text = "CHENNAI" TextBox3.Text = "GINGEE" End If End SubEnd Class

CLASS: 8

Project: 1

‘Eg for Web Browser, Tool Strip box

Form Design:

Legends:

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VB .NET 2008


Private Sub ToolStripLabel1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripLabel1.Click WebBrowser1.GoBack() End Sub

Private Sub ToolStripLabel5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripLabel5.Click Try WebBrowser1.Url = New Uri(ToolStripComboBox1.Text) Timer1.Enabled = True Catch MsgBox("One possible problem is that the address does not begin with http://") End Try End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ToolStripComboBox1.Focus() End Sub

Private Sub ToolStripLabel2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripLabel2.Click WebBrowser1.GoForward() End Sub

Private Sub ToolStripLabel3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripLabel3.Click WebBrowser1.GoHome() End Sub

Private Sub ToolStripLabel4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripLabel4.Click WebBrowser1.Refresh() End Sub

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VB .NET 2008

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick On Error GoTo a ToolStripProgressBar1.Value = ToolStripProgressBar1.Value + 1 If ToolStripProgressBar1.Value = 100 Then ToolStripProgressBar1.Value = 1 Timer1.Enabled = False End Ifa: End Sub

End Class

Project: 2

‘Eg for Tab Control

Form Design:

Legends:

Form Coding:THANKING YOU


VB .NET 2008

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.PictureBox1.Image = Global.Windows_2.My.Resources.Resources.image1 Me.PictureBox2.Image = Global.Windows_2.My.Resources.Resources.image2 Me.PictureBox3.Image = Global.Windows_2.My.Resources.Resources.image3 Me.PictureBox4.Image = Global.Windows_2.My.Resources.Resources.image4 Me.PictureBox5.Image = Global.Windows_2.My.Resources.Resources.image5 End Sub

End Class

Project: 3

‘Eg for Tree View Control

Form Design:

Legends:

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VB .NET 2008

Form Coding:Public Class Form1 Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect

TextBox1.Text = e.Node.Text

If e.Node.Text = "Bike 1" Then PictureBox1.Image = Global.Windows_3.My.Resources.b1 End If



If e.Node.Text = "Car 1" Then PictureBox1.Image = Global.Windows_3.My.Resources.c1 End If



If e.Node.Text = "Wallpaper 1" Then PictureBox1.Image = Global.Windows_3.My.Resources.w1 End If

If e.Node.Text = "Wallpaper 2" Then PictureBox1.Image = Global.Windows_3.My.Resources.w2 End If

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VB .NET 2008

If e.Node.Text = "Wallpaper 3" Then PictureBox1.Image = Global.Windows_3.My.Resources.w3 End If End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TreeView1.CheckBoxes = True End Sub

End Class

Project: 4

‘Eg for List View

Form Design:

Legends:

Form Coding:Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ComboBox1.Items.Add("Large Icon View") ComboBox1.Items.Add("Small Icon View") ComboBox1.Items.Add("List View") End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click ListView1.CheckBoxes = True End Sub

THANKING YOU


VB .NET 2008

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click ListView1.Items.Remove(ListView1.SelectedItems(0)) End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged If ComboBox1.SelectedIndex = 0 Then ListView1.View = View.LargeIcon ElseIf ComboBox1.SelectedIndex = 1 Then ListView1.View = View.SmallIcon Else ListView1.View = View.List End If End SubEnd Class

Project: 5

‘Eg for Checked List Box

Form Design:

Legends:

Form Coding:THANKING YOU


VB .NET 2008

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load CheckedListBox1.Items.Add("MDCA") CheckedListBox1.Items.Add("MDIT") CheckedListBox1.Items.Add("HCDA") CheckedListBox1.Items.Add("MULTIMEDIA") CheckedListBox1.Items.Add("HADWARE")

End SubEnd Class

CLASS: 9

Project: 1 ‘E.g. for data grid view, Data Set, Data Grid View, Binding Source control & to see Table values in Grid View Control without using codingForm Design:

THANKING YOU


VB .NET 2008

Legends:

Form1.text=VIEW ALL DETAILS

Form1.Startup=Center Screen

Project: 2 ‘To see Table values in Grid View Control by using codingForm Design:

THANKING YOU


VB .NET 2008

Form Coding:Imports System.Data.SqlClientPublic Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim cn As New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=F:\VB Dot Net\ADO Dot Net Notes\Class 1\Airtel Customer Details\Airtel Customer Details\Database\db1.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True") cn.Open() MsgBox("Connection success") Dim cm As New SqlCommand("select*from details", cn) MsgBox("Table success") Dim ad As New SqlDataAdapter(cm) Dim ds As New DataSet ad.Fill(ds, "details") DataGridView1.DataSource = ds.Tables("details") End SubEnd Class

CLASS: 10

Project: 1

THANKING YOU


VB .NET 2008

‘Eg for Menu StripForm Design:

Form Coding:Public Class Form1 Private Sub ToolStripMenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem2.Click End End Sub Private Sub ToolStripMenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem3.Click PictureBox1.Image = My.Resources.w1 End Sub Private Sub ToolStripMenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem4.Click PictureBox1.Image = My.Resources.w2 End Sub Private Sub ToolStripMenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem5.Click PictureBox1.Image = My.Resources.w3 End SubEnd Class

Project: 2 ‘Eg for Tool Tips

THANKING YOU


VB .NET 2008

Form Design:

Legends:

Opendialogue1.filter= JPEG files (*.jpg)|*.jpg|GIF files (*.gif)|*.gif


THANKING YOU


VB .NET 2008

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click End End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim i As Image PictureBox1.Image = i End Sub

Private Sub Button1_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.MouseEnter ToolTip1.SetToolTip(Button1, "Click Here to Load Image") ToolTip1.InitialDelay = 5 ToolTip1.ReshowDelay = 110 End Sub

Private Sub Button2_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.MouseEnter ToolTip1.SetToolTip(Button2, "Click Here to Clear Image") ToolTip1.InitialDelay = 5 ToolTip1.ReshowDelay = 110 End Sub

Private Sub Button3_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button3.MouseEnter ToolTip1.SetToolTip(Button3, "Click Here to Quit") ToolTip1.InitialDelay = 5 ToolTip1.ReshowDelay = 110 End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click OpenFileDialog1.ShowDialog() PictureBox1.Image = Image.FromFile(OpenFileDialog1.FileName) PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage End SubEnd Class

CLASS: 11

Project: 1THANKING YOU


VB .NET 2008

‘Eg for Open, Save, Browser, Font, Color Dialog

Form Design:

Form Coding:

Imports System.Collections.ObjectModelPublic Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click RichTextBox1.Text = "" End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click OpenFileDialog1.ShowDialog() RichTextBox1.Text = My.Computer.FileSystem.ReadAllText(OpenFileDialog1.FileName) MsgBox("Data Opened") End Sub

THANKING YOU


VB .NET 2008

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click SaveFileDialog1.Filter = "TXT Files (*.txt*)|*.txt*" SaveFileDialog1.ShowDialog() My.Computer.FileSystem.WriteAllText(SaveFileDialog1.FileName, RichTextBox1.Text, True) MsgBox("Data Saved") End Sub


Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click FolderBrowserDialog1.ShowDialog() TextBox1.Text = FolderBrowserDialog1.SelectedPath MsgBox("see your directory in textbox") End Sub Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click FontDialog1.ShowDialog() RichTextBox1.Font = FontDialog1.Font End Sub

Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click ColorDialog1.ShowDialog() RichTextBox1.ForeColor = ColorDialog1.Color End Sub

Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click ColorDialog1.ShowDialog() RichTextBox1.BackColor = ColorDialog1.Color End Sub

Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click Dim files As ReadOnlyCollection(Of String) files = My.Computer.FileSystem.GetFiles(TextBox1.Text) ComboBox1.DataSource = files End SubEnd Class

CLASS: 12

Project: 1THANKING YOU


VB .NET 2008

‘Eg for Page Setup, Print Dialogue, Print Document, Print view Control Print View Dialog Form Design:

Form Coding:Imports System.Collections.ObjectModelPublic Class Form1 Dim pagenumber As Integer Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click RichTextBox1.Text = "" End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click OpenFileDialog1.ShowDialog() RichTextBox1.Text = My.Computer.FileSystem.ReadAllText(OpenFileDialog1.FileName) MsgBox("Data Opened") End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click SaveFileDialog1.Filter = "TXT Files (*.txt*)|*.txt*" SaveFileDialog1.ShowDialog() My.Computer.FileSystem.WriteAllText(SaveFileDialog1.FileName, RichTextBox1.Text, True) MsgBox("Data Saved") End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click PageSetupDialog1.Document = PrintDocument1 PageSetupDialog1.PrinterSettings = PrintDocument1.PrinterSettings

THANKING YOU


VB .NET 2008

PageSetupDialog1.PageSettings = PrintDocument1.DefaultPageSettings PageSetupDialog1.ShowDialog() PrintDocument1.PrinterSettings = PageSetupDialog1.PrinterSettings PrintDocument1.DefaultPageSettings = PageSetupDialog1.PageSettings End Sub Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click PrintDialog1.Document = PrintDocument1 PrintDialog1.PrinterSettings = PrintDocument1.PrinterSettings PrintDialog1.AllowSomePages = True PrintDialog1.ShowDialog() PrintDocument1.PrinterSettings = PrintDialog1.PrinterSettings PrintDocument1.Print() End Sub Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click PrintDocument1.Print() End Sub Private Sub PrintDocument1_PrintPage(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage pagenumber += 1 Select Case PageNumber Case 1

e.Graphics.FillRectangle(Brushes.Red, _ New Rectangle(200, 200, 500, 500)) e.HasMorePages = True Case 2 e.Graphics.FillRectangle(Brushes.Blue, _ New Rectangle(200, 200, 500, 500)) e.HasMorePages = False End Select End Sub Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click End End Sub Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click PrintPreviewDialog1.Document = PrintDocument1 PrintPreviewDialog1.ShowDialog() End SubEnd Class

CLASS: 13

Project: 1

THANKING YOU


VB .NET 2008

‘Eg for Trackbar, Image List Form Design:

Form Coding:Public Class Form1 Dim I As Integer = 0 Dim J As Integer = 6 Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click Timer1.Enabled = False End Sub

THANKING YOU


VB .NET 2008

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click Timer1.Interval = CInt(TextBox1.Text) Timer1.Enabled = True End Sub

Private Sub TrackBar1_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll TextBox1.Text = TrackBar1.Value End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick If I < 6 Then PictureBox1.Image = ImageList1.Images(I) I = I + 1 End If If I = 6 Then I = 0 End If End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If I < 6 Then PictureBox1.Image = ImageList1.Images(I) I = I + 1 End If If I = 6 Then I = 0 End If

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If J > 0 Then PictureBox1.Image = ImageList1.Images(J) J = J - 1 End If If J = 0 Then J = 6 End If

End SubEnd Class

Project: 2 ‘Eg for Windows Media Player

THANKING YOU


VB .NET 2008

Form Design:

Form Coding:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click OpenFileDialog1.ShowDialog() AxWindowsMediaPlayer1.URL = OpenFileDialog1.FileName End Sub Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load OpenFileDialog1.Filter = "Videos files (*.avi)|*.avi|All files (*.*)|*.*" End Sub Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click AxWindowsMediaPlayer1.close() End Sub End Class

CLASS: 14 PROJECT: 1

THANKING YOU


VB .NET 2008

‘My Computer Object

Form Design:


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox1.Text = My.Computer.Name.ToString TextBox2.Text = My.Computer.Clock.LocalTime.Now TextBox3.Text = My.Computer.Info.AvailablePhysicalMemory TextBox4.Text = My.Computer.Info.OSFullName TextBox5.Text = My.Computer.Info.OSVersion TextBox6.Text = My.Computer.FileSystem.Drives.ToString

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click My.Computer.Audio.Play("C:\WINDOWS\Media\chimes.wav", AudioPlayMode.BackgroundLoop) Button2.Enabled = False Button3.Enabled = True

THANKING YOU


VB .NET 2008

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click My.Computer.Audio.Stop() Button2.Enabled = True Button3.Enabled = False End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click If (My.Computer.Keyboard.CapsLock = True) Then MsgBox("The CAPS LOCK key is on") Else MsgBox("The CAPS LOCK is Off") End If End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click If (My.Computer.Mouse.ButtonsSwapped) Then MsgBox("Functionalities of the mouse buttons have been swapped") Else MsgBox("The mouse is working fine") End If End Sub

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click Dim i As Integer For i = 0 To My.Computer.Ports.SerialPortNames.Count - 1 MsgBox(My.Computer.Ports.SerialPortNames.Item(i)) Next End SubEnd Class

Legends:

PROJECT: 2

‘My User Object

THANKING YOU


VB .NET 2008

Form Design:

Form Coding:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim domainname, username, fullname As String, i As Integer fullname = My.User.Name i = fullname.IndexOf("\") domainname = fullname.Substring(0, i) username = fullname.Substring(i + 1) MsgBox("Domain name : " & domainname & Chr(13) & _ "User name : " & username) End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If My.User.IsAuthenticated Then MsgBox("You are authenticated to delete the file.") My.Computer.FileSystem.DeleteFile("c:\My\mytext.txt") Else MsgBox("Sorry, you are not authenticated to " _ & "delete the file") End If End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click If My.User.IsInRole(ApplicationServices.BuiltInRole.Administrator) Then MsgBox("Current user is an Administrator") ElseIf My.User.IsInRole(ApplicationServices.BuiltInRole.Guest) Then MsgBox("Current user is a Guest") ElseIf My.User.IsInRole(ApplicationServices.BuiltInRole.User) Then MsgBox("Current user is a User") End If End SubEnd Class


‘Cryptography ConceptTHANKING YOU


VB .NET 2008

Form Design:

Form Coding: Imports System.Security.CryptographyImports System.TextPublic Class Form1 Private publicKey, privatekey As String

THANKING YOU


VB .NET 2008

Private EncryptedStrAsByt() As Byte Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Button2.Enabled = False Button3.Enabled = False Button5.Enabled = False Button6.Enabled = False End Sub

Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim cspParam As New CspParameters() cspParam.Flags = CspProviderFlags.UseMachineKeyStore Dim RSA As New RSACryptoServiceProvider(cspParam) publicKey = RSA.ToXmlString(True) ' gets the public key TextBox2.Text = publicKey.ToString() Button2.Enabled = True End Sub

Private Sub Button2_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim str As String = TextBox1.Text Dim RSA2 As New RSACryptoServiceProvider() ' Load the public key to Encrypt Data RSA2.FromXmlString(publicKey) 'Start Encrypting Data EncryptedStrAsByt = RSA2.Encrypt(Encoding.UTF8.GetBytes(str), False) Dim EncryptedStrAsString As Object = Encoding.UTF8.GetString(EncryptedStrAsByt) 'Display Encrypted Data TextBox3.Text = EncryptedStrAsString.ToString() Button3.Enabled = True End Sub

Private Sub Button3_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click 'Start Decrypting Data Dim RSA3 As New RSACryptoServiceProvider() RSA3.FromXmlString(publicKey) Dim DecryptedStrAsByt() As Byte = RSA3.Decrypt(EncryptedStrAsByt, False) Dim DecryptedStrAsString As Object = Encoding.UTF8.GetString(DecryptedStrAsByt) 'Display Decrypted Data TextBox4.Text = DecryptedStrAsString.ToString() End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click Dim cspParam As New CspParameters() cspParam.Flags = CspProviderFlags.UseMachineKeyStore Dim RSA As New RSACryptoServiceProvider(cspParam) privateKey = RSA.ToXmlString(True) ' gets the private key TextBox6.Text = privatekey.ToString()

THANKING YOU


VB .NET 2008

Button5.Enabled = True End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click Dim str As String = TextBox5.Text Dim RSA2 As New RSACryptoServiceProvider() ' Load the private key to Encrypt Data RSA2.FromXmlString(privatekey) 'Start Encrypting Data EncryptedStrAsByt = RSA2.Encrypt(Encoding.UTF8.GetBytes(str), False) Dim EncryptedStrAsString As Object = Encoding.UTF8.GetString(EncryptedStrAsByt) 'Display Encrypted Data TextBox7.Text = EncryptedStrAsString.ToString() Button6.Enabled = True End Sub

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click 'Start Decrypting Data Dim RSA3 As New RSACryptoServiceProvider() RSA3.FromXmlString(privatekey) Dim DecryptedStrAsByt() As Byte = RSA3.Decrypt(EncryptedStrAsByt, False) Dim DecryptedStrAsString As Object = Encoding.UTF8.GetString(DecryptedStrAsByt) 'Display Decrypted Data TextBox8.Text = DecryptedStrAsString.ToString() End SubEnd Class

PROJECT: 2

‘Cryptography Concept in Total File

THANKING YOU


VB .NET 2008

Form Design:

Form Coding: Imports System.TextImports System.IOImports System.SecurityImports System.Security.CryptographyImports System.Runtime.InteropServices

Public Class Form1

'<DllImport("KERNEL32.DLL", EntryPoint:="RtlZeroMemory")>Dim Public Shared ZeroMemory( Destination As IntPtr, Length As Integer) As Boolean

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load button3.Enabled = False End Sub

Private Sub textBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles textBox1.TextChanged If button3.Enabled = False Then toolStripStatusLabel1.Text = "Please specify an input file to encrypt." Else toolStripStatusLabel1.Text = "Please specify an input file to decrypt." End If End Sub

Private Sub textBox2_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles textBox2.TextChanged If button3.Enabled = False Then toolStripStatusLabel1.Text = "Output file path specified. Press the Encrypt File button for encrypting the file." Else

THANKING YOU


VB .NET 2008

toolStripStatusLabel1.Text = "Output file path specified. Press the Decrypt File button for decrypting the file." End If End Sub

Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button1.Click OpenFileDialog1.Filter = "txt files (*.txt)|*.txt"

If OpenFileDialog1.ShowDialog() = DialogResult.OK Then textBox1.Text = OpenFileDialog1.FileName.ToString() toolStripStatusLabel1.Text = "Input file selected.Specify the path for the output file." End If End Sub

Shared Function GenerateSecretKey() As String ' Create an object of the symmetric algorithm. A default secret key and IV are generated. Dim desCrypto As DESCryptoServiceProvider = CType(DESCryptoServiceProvider.Create(), DESCryptoServiceProvider)

' Return the default key Return ASCIIEncoding.ASCII.GetString(desCrypto.Key) End Function

Private Sub button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button2.Click Dim MySecretKey As String ' Get the secret key for encryption MySecretKey = GenerateSecretKey() label4.Text = MySecretKey ' For additional security, pin the key Dim gch As GCHandle = GCHandle.Alloc(MySecretKey, GCHandleType.Pinned) ' Encrypt the input file with the default secret key EncryptFile(textBox1.Text, textBox2.Text, MySecretKey) button3.Enabled = True toolStripStatusLabel1.Text = "Specify the input file to be decrypted." End Sub

Shared Sub EncryptFile(ByVal sInputFilename As String, ByVal sOutputFilename As String, ByVal sKey As String) 'Open the input file Dim FileStreamInputContainer As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read) 'Start encrypting the file Dim fsEncrypted As New FileStream(sOutputFilename, FileMode.Create, FileAccess.Write) Dim DES As New DESCryptoServiceProvider() 'A 64-bit key and IV are required for the DES algorithm 'Set secret key for the DES algorithm DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey) 'Set the IV for the DES algorithm DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)

THANKING YOU


VB .NET 2008

Dim desencrypt As ICryptoTransform = DES.CreateEncryptor() Dim cryptostream As New CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write)

Dim bytearrayinput(FileStreamInputContainer.Length - 1) As Byte FileStreamInputContainer.Read(bytearrayinput, 0, bytearrayinput.Length) cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length) cryptostream.Close() FileStreamInputContainer.Close() fsEncrypted.Close() End Sub

Private Sub button3_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button3.Click Dim MySecretKey As String ' Get the secret key for decrypting the file MySecretKey = label4.Text DecryptFile(textBox1.Text, textBox2.Text, MySecretKey) End Sub

Shared Sub DecryptFile(ByVal sInputFilename As String, ByVal sOutputFilename As String, ByVal sKey As String) Dim DES As New DESCryptoServiceProvider() DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey) DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)

'Create a file stream to read the decrypted file Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read) 'Create a DES decryptor object for the current DES object Dim desdecrypt As ICryptoTransform = DES.CreateDecryptor() 'Create a crypto stream to read and do a 'DES decryption transform on incoming bytes Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read) 'Store the decrypted data in the given output file Dim fsDecrypted As New StreamWriter(sOutputFilename) fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd()) fsDecrypted.Flush() fsDecrypted.Close() End SubEnd Class


‘Airtel Customer details

Form 1:

THANKING YOU


VB .NET 2008

‘Eg for Pointer, Label, Button

Form Design:

Form Coding:Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If TextBox1.Text = "karthi" AndAlso TextBox2.Text = "bss" Then MsgBox("login success") Dim f2 As New Form2 f2.Show() Me.Hide() Else MsgBox("login failed") TextBox1.Focus() End If End SubEnd Class

Legends:Label1.Text=”Enter the Username:”

Label2.Text=”Enter the Password:”

Textbox2.password Char=*

Button1.text=LOGIN!!!

Form1.Border Style= Fixed Tool Window

Form 2:

‘EG Progress bar, Timer Control

Form Design:

THANKING YOU


VB .NET 2008

Form Coding:Public Class Form2 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick On Error GoTo a ProgressBar1.Value = ProgressBar1.Value + 1 Label1.Text = "Loading Complete.." & ProgressBar1.Value & "%" If ProgressBar1.Value = 100 Then MsgBox("Loading completed") Timer1.Enabled = False Dim f3 As New Form3 f3.Show() Me.Hide()a: End If End SubEnd Class

LEGENDS:

Timer1.Enabled=true

Timer1.interval=100

Form2.text=Please Wait..

Label1.Text=Loading..

Form2.Controlbox=false

Form 3:

‘EG MDI, Group Box

THANKING YOU


VB .NET 2008

FORM DESIGN:

Form Coding:Public Class Form3 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim f4 As New Form4 f4.Show() End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim f5 As New Form5 f5.Show() End Sub


THANKING YOU


VB .NET 2008

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick Label2.Text = "DATE:" & DateValue(Now) Label3.Text = "TIME:" & TimeOfDay End SubEnd Class

LEGENDS:

FORM 4:

‘EG Mask Text, Date and Time Picker

THANKING YOU


VB .NET 2008

FORM DESIGN:


Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Dim f3 As New Form3 f3.Show() Me.Hide() End SubEnd Class

LEGENDS:

Form 5:

THANKING YOU


VB .NET 2008

‘EG Data Grid ViewFORM DESIGN:


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim f3 As New Form3 f3.Show() Me.Hide() End SubEnd Class

LEGENDS:

THANKING YOU


VB Dot Net Notes (Developing)

Documents