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ASP Dot Net Tutorial - DataBinding to WebControls
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ASP Dot Net Tutorial - DataGrid Control
ASP Dot Net Tutorial - Advance Practical Examples on DataGrid
ASP Dot Net Tutorial - Working with DataSets
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ASP Dot Net Tutorial - Forms Based Authentication
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  Home > Courses, Tutorials & eBooks > ASP.NET Tutorial > Advance Practical Examples on DataGrid

ASP.NET Tutorial - Advance Practical Examples on DataGrid

                                                                                                                 Page 5 of 5

Edit column in a Datagrid Control

In Example 46 ExpertDataGridEditCommandColumn.aspx there is one problem that there is no Update command execution. This example is an answer to that problem. Therefore the values here are updating using update command in the subroutine.


Example 50 ExpertDataGridEditEmployees.aspx

<%@ Import Namespace="System.Data.SqlClient" %>

 <Script Runat="Server">

 Dim conNorthwind As SqlConnection

Dim cmdSql As SqlCommand

Dim strSql As String

 Sub Page_Load

conNorthwind=New SqlConnection( "Server=localhost; UID=sa; PWD=secret;Database=Northwind" )

If Not IsPostBack Then


End If

End Sub

 Sub BindDataGrid

cmdSql = New SqlCommand( "Select * From Employees", conNorthwind )


dgrdEmployees.DataSource = cmdSql.ExecuteReader() dgrdEmployees.DataBind()


End Sub

 Sub dgrdEmployees_EditCommand( s As Object, e As DataGridCommandEventArgs )

dgrdEmployees.EditItemIndex = e.Item.ItemIndex


End Sub

 Sub dgrdEmployees_UpdateCommand( s As Object, e As DataGridCommandEventArgs )

Dim intEmployeeID As Integer

Dim txtFirstName As TextBox

Dim strFirstName As String

intEmployeeID = dgrdEmployees.DataKeys( e.Item.ItemIndex )

txtFirstName = e.Item.Cells( 1 ).Controls( 0 )

strFirstName = txtFirstName.Text

strSql = "Update Employees Set FirstName=@FirstName " _

& " Where EmployeeID=@EmployeeID"

cmdSql = New SqlCommand( strSql, conNorthwind )

cmdSql.Parameters.Add( "@FirstName", strFirstName )

cmdSql.Parameters.Add( "@EmployeeID", intEmployeeID )




dgrdEmployees.EditItemIndex = -1


End Sub

 Sub dgrdEmployees_CancelCommand( s As Object, e As DataGridCommandEventArgs )

dgrdEmployees.EditItemIndex = -1


End Sub





<form Runat="Server">













HeaderText="Employee ID"


ReadOnly="True" />


HeaderText="First Name" DataField="FirstName" />




CancelText="Cancel!" />







The output of this example is shown below :

It can be seen that updation is possible.

When an item is selected for editing, the dgrdEmployees_EditCommand subroutine is executed. This subroutine sets the value od EditItemIndex property of the DataGrid. When the Update link is clicked then dgrdEmployees_UpdateCommand subroutine executes and FirstName column of employees table is updated. Each row of a DataGrid consists of cell and each cell contains controls.

After a column is updated in the database, the DataGrid control’s EditItemIndex property is assigned the value -1. Any item can be unselected by this value for editing in the DataGrid.


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