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GridView.OnSelectedIndexChanging Method

Raises the SelectedIndexChanging event.

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

protected virtual void OnSelectedIndexChanging(
	GridViewSelectEventArgs e
)

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

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

The OnSelectedIndexChanging method also allows 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 overriding OnSelectedIndexChanging in a derived class, be sure to call the base class's OnSelectedIndexChanging method so that registered delegates receive the event.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
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