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GridView.RowEditing Event

Note: This event is new in the .NET Framework version 2.0.

Occurs when a row's Edit button is clicked, but before the GridView control enters edit mode.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

'Declaration
Public Event RowEditing As GridViewEditEventHandler
'Usage
Dim instance As GridView
Dim handler As GridViewEditEventHandler

AddHandler instance.RowEditing, handler

/** @event */
public void add_RowEditing (GridViewEditEventHandler value)

/** @event */
public void remove_RowEditing (GridViewEditEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

The RowEditing event is raised when a row's Edit button is clicked, but before the GridView control enters edit mode. This allows you to provide an event-handling method that performs a custom routine, such as canceling the edit operation, whenever this event occurs.

A GridViewEditEventArgs object is passed to the event-handling method, which allows you to determine the index of the current row and to indicate that the edit operation should be canceled. To cancel the edit operation, set the Cancel property of the GridViewEditEventArgs object to true.

For more information about handling events, see Consuming Events.

The following code example demonstrates how to use the RowEditing event to cancel the editing operation if the user attempts to edit the record for a company in the United States.


<%@ Page language="VB" %>

<script runat="server">

  Sub CustomersGridView_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
        
    ' Get the country for the row being edited. For this example, the
    ' country is contained in the seventh column (index 6). 
    Dim country As String = CustomersGridView.Rows(e.NewEditIndex).Cells(6).Text

    ' For this example, cancel the edit operation if the user attempts
    ' to edit the record of a customer from the United States. 
    If country = "USA" Then
    
      ' Cancel the edit operation.
      e.Cancel = True
      Message.Text = "You cannot edit this record."
     
    Else
      
      Message.Text = ""
      
    End If
    
  End Sub
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView RowEditing Example</h3>
          
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogenerateeditbutton="true"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowediting="CustomersGridView_RowEditing"   
        runat="server">
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>


Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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