Identifier of the upload stream the Progress event is raised for.
value = getImageUploader("ImageUploaderID").getCurrentConnectionId();
A positive number that means the identifier of the upload stream the Progress event is raised for.
This property is meaningless when used outside of the Progress event handler. This value is guarantied to be in range [0, MaxConnectionCount - 1].
This property is useful when files are uploaded with several concurrent connections. If you write the Progress event handler which should display different information for different upload stream, use this property to detect which connection the event is raised for.