Event which is raised when this datasource control is about to perform the update action on an entity. If LivePersistence is set to false, this event is raised right before the entity to update is added to the unitofwork(2) object. Cancelling this event will abort the update action and the entity won't be inserted. The entity to update is part of the event args.

public event EventHandler<CancelableDataSourceActionEventArgs> EntityUpdating

Public Event EntityUpdating As EventHandler(Of CancelableDataSourceActionEventArgs)