public void DeletePlaylist(PlaylistItem p) { if (p.IsSmart) { if (ApplicationSettingsHelper.PredefinedSmartPlaylistsId().ContainsKey(p.Id)) { } else { Playlists.Remove(p); DatabaseManager.DeleteSmartPlaylist(p.Id); } } else { Playlists.Remove(p); DatabaseManager.DeletePlainPlaylist(p.Id); } }