Assembly: System.Web (in system.web.dll)
Raising an event invokes the event handler through a delegate. For more information, see Consuming Events.
If you are not familiar with the Data Access features in ASP.NET 2.0, you should read some of these topics before continuing:
The OnInit 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 the OnInit method in a derived class, be sure to call the OnInit method for the base class so that registered delegates receive the event.