Assembly: System.Web (in system.web.dll)
The SelectedIndexChanged event is raised when a row's Select button is clicked, but after the GridView control handles the select operation. This allows you to provide an event-handling method that performs a custom routine, such as updating a status label with the currently selected row, whenever this event occurs.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The OnSelectedIndexChanged 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 OnSelectedIndexChanged in a derived class, be sure to call the base class's OnSelectedIndexChanged method so that registered delegates receive the event.