System.Web 2.0.0.0 System.Delegate System.Void To be added. To be added. The method specified in the delegate is called when a event, event, or event is raised. Page developers can provide custom handlers for Web Parts events by adding an OnSelectedWebPartChanging attribute, OnWebPartClosing attribute, or OnWebPartDeleting attribute to the <asp:webpartmanager> element in a page, and assigning a custom method name to the attribute. A custom handler can also be assigned programmatically. For more information on programmatically assigning an event handler, see How to: Connect Event Handler Methods to Events.

Represents the method that will handle the event, event, or event of the class.