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ADO.NET in ASP.NET As we have seen before, we can program using

ADO.NET in two ways By explicitly writing code to create

Connection, DataReader,DataAdpater etc. and then binding themwith controls traditional way

By dragging and dropping controls and

configuring them visually. DataBinding New feature in ASP 2.0. We will use the 2nd approach in this session.

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DataBinding

ASP.NET includes a rich and full-featured modelfor data binding .

Data binding is a technique of binding asp.netweb controls to the Data Source controls so thatdata is automatically fetched and shown.

Data Source controls are the controls that linksitself with data sources like SQLserver, Oracle,Access etc.

Data binding is declarative, not programmatic.

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Data Source Controls

Most of standard web controls (like TextBox, Label, LinkButton

etc., )support single-value data binding. Controls like ListBox, DropDownList support multi-value. As with windows form application, for web application also

there is a GridView which is specifically data-bound control. But apart from GridView, the diagram shows other controls

also which are available for the web form.

DataSource controls

Special data controls

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Creating SQLServer Databasetables

Let us create two tables in a SQLServer database.

Enter some sample data.

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Creating DataSource control Create a new asp.net web project. Drag and drop SQLDataSource Control in

Default.aspx . Dragging a dropping the control leads to entry of a new

line in the source

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Configuring the DataSource1. Right click and click on Configure Data Source.2. Select the database that you configured.

Ensure that this isticked. This makes anentry in web.config file .

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1. Select table and the columns.2. Click on Advanced and tick this

1. Test Query and click on Finish

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Viewing the properties of DataSource control

Similarly look at the InsertQuery and Update Querytoo. This happened because of step 5

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Viewing data source code in aspx

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SelectCommand="SELECT [EID], [Name] FROM [Employee]"UpdateCommand="UPDATE [Employee] SET [Name] = @Name

WHERE [EID] = @EID">

Data types enforcedfor the parameters

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Build and Execute

Edit and Upadate

After delete

Note that the GridView was not designedto insert new rows.

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Specifying form parameters in theselect query

Drag and drop a text box and a button on to the form. Select property of the SQLDataSource and go to select

query.

Click on Query builder.

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Building Query Enter the where clause and

click ok. Click on refresh

parameters. Select Control for

Parameter Source andselect the name of textboxcontrol you dropped for controlID.

Click OK

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Execute

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Types of parameters

Apart from Control, parameter for the query could beHTML Form parameters, Query String, Session data,Cookie or a key from user profile.

Code that just got added

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Form Control Create another Der form. Drag and drop the SQLDataSource and configure in the

same way.

Drag and drop FormView and link it to the data source. Apply template , enable paging. Test

Try inserting,updating anddeleting

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protected void UpdatEEMP(object sender,

SqlDataSourceCommandEventArgs e){e.Command.Parameters["@Name"].Value =e.Command.Parameters["@FirstName"].Value;

e.Command.Parameters["@Last"].Value =e.Command.Parameters["@LastName"].Value;e.Command.Parameters.Remove(e.Command.Parame

ters["@FirstName"]);

e.Command.Parameters.Remove(e.Command.Parameters["@LastName"]);}