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ListView.OnSelectedIndexChanging Method

Raises the SelectedIndexChanging event.

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

protected virtual void OnSelectedIndexChanging(
	ListViewSelectEventArgs e
)

ExceptionCondition
InvalidOperationException

There is no handler for the SelectedIndexChanging event.

The SelectedIndexChanging event is raised when an item's Select button is clicked, but before the ListView control handles the select operation. (A Select button is a button control whose CommandName property is set to "Select".) This enables you to perform a custom routine whenever this event occurs, such as canceling the selection operation.

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnSelectedIndexChanging method also enables derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors

When you override OnSelectedIndexChanging in a derived class, call the base class's OnSelectedIndexChanging method so that registered delegates receive the event.

.NET Framework

Supported in: 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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