public MusicViewModel() { SongGroups = Enumerable.Empty <IGrouping <string, Track> >(); ArtistGroups = Enumerable.Empty <IGrouping <string, Artist> >(); AlbumGroups = Enumerable.Empty <IGrouping <string, Album> >(); Playlists = Enumerable.Empty <Playlist>(); Songs = Enumerable.Empty <Track>(); Artists = Enumerable.Empty <Artist>(); Albums = Enumerable.Empty <Album>(); AlbumSortItems = MusicRepository.GetAlbumSortItems().Select(item => new SelectListItem { Text = item.Name, Value = item.Value.ToString() }); ArtistSortItems = MusicRepository.GetArtistSortItems().Select(item => new SelectListItem { Text = item.Name, Value = item.Value.ToString() }); SongSortItems = MusicRepository.GetSongSortItems().Select(item => new SelectListItem { Text = item.Name, Value = item.Value.ToString() }); }