ASPdotNET Presentation Part2

8/14/2019 ASPdotNET Presentation Part2

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Softsmith Infotech

.Net

Table of contents Introduction to VS 2005 Application and Page Frameworks GUI Controls Validation Server Controls Working with Master Pages Themes & Skins Collections & Lists

Data Binding Data Management with ADO.Net Working with XML Site Navigation Security State Management Caching Debugging & Error Handling File I/O & Streams Configurations


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Working with Master Pages

All web application will have a master page or a

home page If we hit a website the default page that comes is

the home page

It will have the name index.html or default.aspxor home.html or some thing like that.

From this master page, we navigate to the restof the pages through buttons or links

To set a page as the master page all we need todo is, just right click on the aspx page in thesolution explorer and select Set as Start Pagefrom the pop up menu.


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Themes and Skins

Themes and Skins provide a good look

and feel to our site or web application.

We can set the theme using CSS(Cascading Style Sheet)

In the portion of our aspx page if

we give

then the particular style specified in the

CSS will be used for the page


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Themes and Skins

We can also allow the user to change the

skin (color of controls on the application)

and dynamically deliver the theme and

skin on his browser.

This is achieved using session variables.

Once the user selects a skin,the value is

stored in a session variable and it will be

used for the session.


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Themes and Skins

If the user want the same skin to beapplied whenever he logs in, there are twoways to achieve that.

Cookies The information will be stored onthe clients system and will be taken when helogs in from the system again. But this willwork only in a particular system

To make this global, the information need tobe stored on the server, in a table against theuser name.


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Namespaces

Compilation units that let you organize andreuse code

No relationship between namespaces and filestructure (unlike Java)

Namespaces provide a way to uniquely identifya type

Provides logical organization of types

Namespaces can span over assemblies

Namespaces can be nested

The fully qualified name of a type includes allnamespaces


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Namespaces

The fully qualified name of a type includes all namespaces

Namespaces are mainly used to distinguish between the objects

having same names

With-in a namespace, the names of all the objects should be unique

namespace N1 { // is referred to as N1

class C1 { // is referred to as N1.C1

class C2 { // is referred to as N1.C1.C2

} //End of N1.C1.C2

} //End of N1.C1

namespace N2 { // is referred to as N1.N2

class C2 { // is referred to as N1.N2.C2

} // End of N1.N2.C2

} //End of N1.N2

} //End of N1


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Collections

A collection is a specialized class that organizes and exposes a

group of objects

Various collection classes are ArrayList, SortedList, BitArray,

HashTable, Queue and Stack

They are all included in System.Collections namespace

Like arrays, members of collections can be accessed by an index

Unlike arrays, collections can be resized dynamically


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ArrayList

Arraylist allows to dynamically add and removeitems from a simple list

Array List is a zero based collection

The items in the list are retrieved by accessingthe item index

Methods Add()

Remove()

RemoveAt()

Count()

Property Capacity


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SortedList

Stores elements in the collection as a key-value pair that are sorted bythe keys

The elements in the SortedList can be accessed by key as well as byindex

A key cannot be a null reference whereas a value can be a nullreference

Any time when an element is added or removed from the collection,the indexes are adjusted to keep the list in the sorted order. Hencesuch operations are slower in this collection

Methods Add()

Remove() RemoveAt() Count()

Property Count, Capacity, Item, Keys, Values


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Data Binding

Bounding values to the controls

.DataBind() method binds

values for the control

Page.DataBind() binds all the controls on

the page

Types Single value data binding

Multi value data binding


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Single Value Data Binding

Applicable for server controls that displays

one data at a time

Controls like

Textbox

Label


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Multi Value Data Binding

Involves binding server controls to

ArrayList or SortedList or any collection

object

Example

Populating a drop down list with a collection

object or a data set

Populating a Data grid with a data set


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Data Management with

ADO.Net ADO ActiveX Data Objects

Namespace

System.Data Types

Odbc For working with MySQL etc

OleDb For working with OLEDB (Excel etc)

Sql For working with MS SQL data bases

Oracle For working with Oracle databases


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Data Management

Classes used (for Sql)

Connection - SqlConnection

Command - SqlCommand

DataReader - SqlDataReader

DataAdapter SqlDataAdapter

For other database types, we need to putthe appropriate prefix.(like

OdbcConnection and so on)


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Connection

OdbcConnection con = new

OdbcConnection(Connection string)

Connection string has details about which

database is to be used and what is the

user name and password are.

Example Driver={MySQL ODBC 3.51 Driver};SERVER=localhost;DATABASE=test;

password=sa;user id=root;


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Connection Methods

Open Opens a connection

Close Closes a connection

It is recommended to open a connection

only if it is needed and close it when it is

no longer needed. This would avoidwastage of system resources


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Command

OdbcCommand cmd = new

OdbcCommand(Query, con);

Query SQL query like select * from

table1

con is the connection object created

Command object property CommandType This can be text or storedprocedure or table


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DataReader

OdbcDataReader dr = new OdbcDataReader();

Usage - dr.Method

DataReader Methods:

ExecuteReader For reading one or more rows (for

select * from)

ExecuteScalar For reading a scalar value like select

count(*) from

ExecuteNonQuery for inserting or updating or

deleting or executing a stored procedure or function


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DataAdapter

This is for filling data from more than onetables

The data get filled into a DataSet

OdbcDataAdapter da = newOdbcDataAdapter(cmd)

cmd command object created using the

connection and SQL statement This will fetch the result of the command

and stores it in the adapter


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DataAdapter

To put the data in a dataset, use the Fill

method

da.Fill(ds) DataSet ds = new DataSet()

We can also have DataTable or DataRow

or DataView instead of DataSet

Data adapter automatically opens andcloses a connection. No need of having

explicit open and close of a connection.


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Working with XML

XML eXtensible Markup Language

Uses

XML can be used to Store Data XML is used to create configuration files

for different applications

XML is used to Exchange Data in cross-platform applications

Used in Web applications


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Opening an XML

System.Xml namespace is required

Opening from an URLXmlDocument myDoc = new XmlDocument();

myDoc.Load ("http://localhost/sample.xml");

Opening from a location in the local

systemXmlDocument myDoc = new XmlDocument();

FileStream myFile = new

FileStream("myDoc.xml",FileMode.Open);

myDoc.Load(myFile);

myFile.Close();


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Reading the XML document

XmlElement Class for accessing

individual elements in a xml file

Attributes, FirstChild, LastChild, InnerText,

InnerXml, Name

XmlAttribute Class for accessing

attributes of the individual xml elements

Name

Value


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Example

To get the name and values of attributes in a xml file

/* Get the Attribute Collection */

XmlAttributeCollection attrs = myElement.Attributes;

/* Get the number of Attributes */

int aCount = attrs.Count;

for (i=0; i< aCount; i++)

{

Console.WriteLine (attrs[i].Name);Console.WriteLine (attrs[i].Value);

}


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Writing XML

Create XML Document objectXmlDocument myDoc = new XmlDocument();

Load the root element

myDoc.LoadXml ("");

Create an element and add it to the parent

elementXmlElement myChildEle =

myDoc.CreateElement(Topic");

myChildEle.InnerText = Dot Net";

ParentElement.AppendChild (myChildEle);


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Writing XML

Create an attributeXmlAttribute myAttribute =

myDoc.CreateAttribute(Trainer");

myAttribute.Value = Softsmith";

Add it to Parent elementParentElement.SetAttributeNode (myAttribute);

XML file will be

Dot Net


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XmlReader and XmlWriter

XmlReader To read an XML file

XmlWriter To write Xml to a file (creating

xml)

XmlReaderstring filename=@"books.xml";

XmlTextReader bookXmlReader = new XmlTextReader (filename);

XmlWriterstring fileName = @"booksnew.xml";

XmlTextWriter bookXmlWriter = new XmlTextWriter(fileName,null);


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XmlReader Example

public void ReadDocument (XmlReader xmlR)

{

try {

// read (pull) the next node in document order

while (xmlR.Read()) {

// print the current node's name & typeConsole.WriteLine(xmlR.NodeType + " " + xmlR.Name);

}

}

catch(XmlException e) {

Console.WriteLine ("Error: " + e.Message);}

}


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XmlWriter Examplepublic void WriteDocument(XmlWriter writer)

{

writer.WriteStartDocument();

writer.WriteStartElement ("Person");

writer.WriteAttributeString ("Gender", "Male");

writer.WriteAttributeString ("Name", "Abc");

writer.WriteElementString ("Phone", "111-222-3333");

writer.WriteElementString ("Phone", "111-222-4444");

writer.WriteEndElement();

writer.WriteEndDocument();

writer.Close();

}

Output:

111-222-3333111-222-4444

ASPdotNET Presentation Part2

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