ListView::ItemCanceling Event

Occurs when a cancel operation is requested, but before the ListView control cancels the insert or edit operation.

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

public:
 event EventHandler<ListViewCancelEventArgs^>^ ItemCanceling {
	void add (EventHandler<ListViewCancelEventArgs^>^ value);
	void remove (EventHandler<ListViewCancelEventArgs^>^ value);
}
<asp:ListView OnItemCanceling="EventHandler" />

The ListView control raises the ItemCanceling event when a Cancel button in the InsertItemTemplate or EditItemTemplate template is clicked, but before the ListView control cancels the insert or edit operation. (A Cancel button is a button control whose CommandName property is set to "Cancel".) This enables you to perform a custom routine whenever this event occurs, such as stopping the cancel operation if it would put the item in an unwanted state.

A ListViewCancelEventArgs object is passed to the event handler, which enables you to determine the index of the item. It also lets you indicate that the cancel operation should be stopped. To stop the operation, set the Cancel property of the ListViewCancelEventArgs object to true.

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

The following example shows how to create an ItemCanceling event handler.

Security noteSecurity Note

This example contains text boxes that accept user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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