The RadCloudUpload control exposes an ItemStateChanged event. It is raised when an item in the Items collection changes its state. In the handler of this event you can implement logic that can be executed when upload starts or upload ends. The arguments of this event are of type CloudUploadFileStateChangedEventArgs and expose the following members:
Item - this member is of type CloudUploadFile and holds the item which status is changed.
PreviousState and NewState - the type of these members is CloudUploadFileState and they hold the state in which the item was before the event was invoked and the state that the item will be after the event is invoked.