Assembly: System.Web.Entity (in System.Web.Entity.dll)
Handle the event to supply your own ObjectContext instead of having a new ObjectContext created. If the event is not handled or the handler does not provide an ObjectContext, the EntityDataSource creates one according to its configuration. When an ObjectContext is provided to the event, the same instance is assigned to the Context property of the event object of successive events. For more information, see Object Context Life-Cycle Management (EntityDataSource). For more information about the object context, see Identity Resolution, State Management, and Change Tracking (Entity Framework).