GridView.RowDeleting Event (System.Web.UI.WebControls)

RowDeleting Event

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

GridView..::.RowDeleting Event

Updated: November 2007

Occurs when a row's Delete button is clicked, but before the GridView control deletes the row.

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

Syntax

Visual Basic (Declaration)

Public Event RowDeleting As GridViewDeleteEventHandler

Visual Basic (Usage)

Dim instance As GridView
Dim handler As GridViewDeleteEventHandler

AddHandler instance.RowDeleting, handler

public event GridViewDeleteEventHandler RowDeleting

Visual C++

public:
 event GridViewDeleteEventHandler^ RowDeleting {
    void add (GridViewDeleteEventHandler^ value);
    void remove (GridViewDeleteEventHandler^ value);
}

/** @event */
public void add_RowDeleting (GridViewDeleteEventHandler value)
/** @event */
public void remove_RowDeleting (GridViewDeleteEventHandler value)

JScript

JScript does not support events.

ASP.NET

<asp:GridView OnRowDeleting="GridViewDeleteEventHandler" />

Remarks

The RowDeleting event is raised when a row's Delete button is clicked, but before the GridView control deletes the row. This enables you to provide an event-handling method that performs a custom routine, such as canceling the delete operation, whenever this event occurs.

A GridViewDeleteEventArgs object is passed to the event-handling method, which enables you to determine the index of the current row and to indicate that the delete operation should be canceled. To cancel the delete operation, set the Cancel property of the GridViewDeleteEventArgs object to true. You can also manipulate the Keys and Values collections, if necessary, before the values are passed to the data source.

For more information about handling events, see Consuming Events.

Examples

The following example demonstrates how to use the RowDeleting event to cancel the deleting operation if the user attempts to remove the last record from a GridView control.

Visual Basic

<%@ Page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub CustomersGridView_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)

    ' Cancel the delete operation if the user attempts to remove
    ' the last record from the GridView control.
    If CustomersGridView.Rows.Count <= 1 Then

      e.Cancel = True
      Message.Text = "You must keep at least one record."

    End If

  End Sub

</script>

<html  >
  <head runat="server">
    <title>GridView RowDeleting Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>GridView RowDeleting 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"
        autogeneratedeletebutton="true"
        datakeynames="CustomerID"
        onrowdeleting="CustomersGridView_RowDeleting"  
        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]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>

    </form>
  </body>
</html>

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void CustomersGridView_RowDeleting(Object sender, GridViewDeleteEventArgs e)
  {

    // Cancel the delete operation if the user attempts to remove
    // the last record from the GridView control.
    if (CustomersGridView.Rows.Count <= 1)
    {

      e.Cancel = true;
      Message.Text = "You must keep at least one record.";

    }

  }  

</script>

<html  >
  <head runat="server">
    <title>GridView RowDeleting Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>GridView RowDeleting 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"
        autogeneratedeletebutton="true"
        datakeynames="CustomerID"
        onrowdeleting="CustomersGridView_RowDeleting"  
        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]"
        deletecommand="Delete from Customers where CustomerID = @CustomerID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>

    </form>
  </body>
</html>

Platforms

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

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

Version Information