Raises the ItemUpdating event.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
The ItemUpdating event is raised when an item's Update button is clicked or the UpdateItem method is called, but before the ListView control updates the item. (An Update button is a button control whose CommandName property is set to "Update".) This enables you to perform a custom routine whenever this event occurs, such as canceling the update operation.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The method also enables 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 you override in a derived class, call the base class's method so that registered delegates receive the event.