System.Web 2.0.0.0 System.Delegate System.Void To be added. To be added. The control raises the event when an Update button (a button with its CommandName property set to "Update") within the control is clicked, but before the control updates the record. This allows you to provide an event-handling method that performs a custom routine, such as HTML encoding or validating the values of a record before updating it in the data source, whenever this event occurs. When you create a delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

Represents the method that handles the event of a control.