System.Web.Extensions (in System.Web.Extensions.dll)
Protected Overridable Sub OnItemUpdating (
e As ListViewUpdateEventArgs
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 NIB: Raising an Event.
The OnItemUpdating 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 OnItemUpdating in a derived class, call the base class's OnItemUpdating method so that registered delegates receive the event.
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Available since 3.5