View. On Selected Index Changing(GridViewSelectEventArgs) Method
Raises the SelectedIndexChanging event.
protected: virtual void OnSelectedIndexChanging(System::Web::UI::WebControls::GridViewSelectEventArgs ^ e);
protected virtual void OnSelectedIndexChanging (System.Web.UI.WebControls.GridViewSelectEventArgs e);
abstract member OnSelectedIndexChanging : System.Web.UI.WebControls.GridViewSelectEventArgs -> unit override this.OnSelectedIndexChanging : System.Web.UI.WebControls.GridViewSelectEventArgs -> unit
Protected Overridable Sub OnSelectedIndexChanging (e As GridViewSelectEventArgs)
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 Handling and Raising Events.
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(GridViewSelectEventArgs) in a derived class, be sure to call the base class's OnSelectedIndexChanging(GridViewSelectEventArgs) method so that registered delegates receive the event.