GridViewDeleteEventArgs Class

.NET Framework (current version)

Other Versions

Provides data for the RowDeleting event.

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

Inheritance Hierarchy

System.Object
System.EventArgs
System.ComponentModel.CancelEventArgs
System.Web.UI.WebControls.GridViewDeleteEventArgs

Syntax

C++

Public Class GridViewDeleteEventArgs
	Inherits CancelEventArgs

Constructors

	Name	Description
	GridViewDeleteEventArgs(Int32)	Initializes a new instance of the GridViewDeleteEventArgs class.

Properties

	Name	Description
	Cancel	Gets or sets a value indicating whether the event should be canceled.(Inherited from CancelEventArgs.)
	Keys	Gets a dictionary of field name/value pairs that represent the primary key of the row to delete.
	RowIndex	Gets the index of the row being deleted.
	Values	Gets a dictionary of the non-key field name/value pairs for the row to delete.

Methods

	Name	Description
	Equals(Object)	Determines whether the specified object is equal to the current object.(Inherited from Object.)
	Finalize()	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)
	GetHashCode()	Serves as the default hash function. (Inherited from Object.)
	GetType()	Gets the Type of the current instance.(Inherited from Object.)
	MemberwiseClone()	Creates a shallow copy of the current Object.(Inherited from Object.)
	ToString()	Returns a string that represents the current object.(Inherited from Object.)

The GridView control raises the RowDeleting event when a Delete button is clicked, but before the GridView control deletes the record. (A Delete button is a button control whose CommandName property is set to "Delete".) You can perform a custom routine whenever this event occurs, such as canceling the delete operation.

A GridViewDeleteEventArgs object is passed to the event handler. This enables you to determine the index of the row being deleted and to cancel the delete operation. To cancel the delete operation, set the Cancel property of the GridViewDeleteEventArgs object to true. You can also manipulate the Keys and Values collections before the values are passed to the data source.

For more information about how to handle events, see NIB: Consuming Events.

For a list of initial property values for an instance of GridViewDeleteEventArgs, see the GridViewDeleteEventArgs constructor.

Examples

The following example shows how to use the GridViewDeleteEventArgs object that is passed to the event handler. The code cancels the delete operation if the user tries to remove the last record from a GridView control.


<%@ 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">

    Private Sub CustomersGridView_RowDeleting _
        (ByVal sender As [Object], _
        ByVal e As GridViewDeleteEventArgs)
        Dim cell As TableCell
        cell = CustomersGridView.Rows(e.RowIndex).Cells(2)
        If cell.Text = "Beaver" Then
            e.Cancel = True
            Message.Text = "You cannot delete customer Beaver."
        Else
            Message.Text = ""
        End If
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" 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 />
    <asp:GridView ID="CustomersGridView" runat="server" 
        DataSourceID="CustomersSqlDataSource" 
        AutoGenerateColumns="False"
        AutoGenerateDeleteButton="True" 
        OnRowDeleting="CustomersGridView_RowDeleting"
        DataKeyNames="CustomerID,AddressID">
        <Columns>
            <asp:BoundField DataField="FirstName" 
                HeaderText="FirstName" SortExpression="FirstName" />
            <asp:BoundField DataField="LastName" HeaderText="LastName" 
                SortExpression="LastName" />
            <asp:BoundField DataField="City" HeaderText="City" 
                SortExpression="City" />
            <asp:BoundField DataField="StateProvince" HeaderText="State" 
                SortExpression="StateProvince" />
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="CustomersSqlDataSource" runat="server"
        SelectCommand="SELECT SalesLT.CustomerAddress.CustomerID, 
            SalesLT.CustomerAddress.AddressID, 
            SalesLT.Customer.FirstName, 
            SalesLT.Customer.LastName, 
            SalesLT.Address.City, 
            SalesLT.Address.StateProvince 
            FROM SalesLT.Customer 
            INNER JOIN SalesLT.CustomerAddress 
            ON SalesLT.Customer.CustomerID = 
                SalesLT.CustomerAddress.CustomerID 
            INNER JOIN SalesLT.Address ON SalesLT.CustomerAddress.AddressID = 
                SalesLT.Address.AddressID"
        DeleteCommand="Delete from SalesLT.CustomerAddress where CustomerID = 
            @CustomerID and AddressID = @AddressID" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorksLTConnectionString %>">
        <DeleteParameters>
            <asp:Parameter Name="AddressID" />
            <asp:Parameter Name="CustomerID" />
        </DeleteParameters>
    </asp:SqlDataSource>
    </form>
</body>
</html>

Version Information

.NET Framework
Available since 2.0

Thread Safety

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.