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GridViewEditEventHandler Delegate

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

Represents the method that handles the RowEditing event of a GridView control.

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

public delegate void GridViewEditEventHandler (
	Object sender,
	GridViewEditEventArgs e
)
/** @delegate */
public delegate void GridViewEditEventHandler (
	Object sender, 
	GridViewEditEventArgs e
)
JScript supports the use of delegates, but not the declaration of new ones.

Parameters

sender

The source of the event.

e

A GridViewEditEventArgs object that contains the event data.

The RowEditing event is raised when an Edit button (a button with its CommandName property set to "Edit") 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.

When you create a GridViewEditEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

The following example demonstrates how to programmatically add a GridViewEditEventHandler delegate to the RowEditing event of a GridView control.


<%@ Page language="C#" %>

<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {
        
    // Create a new GridView control.
    GridView customersGridView = new GridView();

    // Set the GridView control's properties.
    customersGridView.ID = "CustomersGridView";
    customersGridView.DataSourceID = "CustomersSqlDataSource";
    customersGridView.AutoGenerateColumns = true;
    customersGridView.AutoGenerateEditButton = true;
    customersGridView.AllowPaging = true;
    customersGridView.DataKeyNames = new String[] { "CustomerID" };
      
    // Programmatically register the event-handling method.
    customersGridView.RowEditing += new GridViewEditEventHandler(this.CustomersGridView_RowEditing);
        
    // Add the GridView control to the Controls collection
    // of the PlaceHolder control.
    GridViewPlaceHolder.Controls.Add(customersGridView);
        
  }

  void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs e)
  {

    // User the sender parameter to retrieve the GridView control
    // that raised the event.
    GridView customersGridView = (GridView)sender;
    
    // Get the country for the row being edited. For this example, the
    // country is contained in the seventh column (index 6). 
    String country = 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 USA. 
    if (country == "USA")
    {
      // Cancel the edit operation.
      e.Cancel = true;
      Message.Text = "You cannot edit this record.";
    }
    else
    {
      Message.Text = "";
    }
    
  }
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridViewEditEventHandler Example</h3>
          
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>
            
      <asp:placeholder id="GridViewPlaceHolder"
        runat="server"/>
            
      <!-- 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>


The following example demonstrates how to declaratively add a GridViewEditEventHandler delegate to the RowEditing event of a GridView control.


<%@ Page language="C#" %>

<script runat="server">

  void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs e)
  {
    
    // Get the country for the row being edited. For this example, the
    // country is contained in the seventh column (index 6). 
    String country = 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 Unites States. 
    if (country == "USA")
    {
      // Cancel the edit operation.
      e.Cancel = true;
      Message.Text = "You cannot edit this record.";
    }
    else
    {
      Message.Text = "";
    }
    
  }
    
</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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