internal SingleTrackUpdater(Track track, IMusicSession iContext):base(track.SingleItemCollection(), iContext) { _Tr = track; if (_Tr == null) throw new Exception("Track can not be null"); this._Artist = _Tr.Artist; this._Name= _Tr.Name; this._TN= _Tr.TrackNumber; this._DiscNumber = _Tr.DiscNumber; }