public void AddSongToPlaylist(Playlist selectedPlaylist, Song song)
 {
     QueryManager.PlaylistAddSong(selectedPlaylist, song);
     SongList.Add(song);
 }
 public void RemoveSongFromPlaylist(Playlist playlist, Song song)
 {
     QueryManager.PlaylistRemoveSong(playlist, song);
     SongList.Remove(song);
 }
 public void CreatePlaylist(Playlist playlist)
 {
     playlist.PlaylistId = QueryManager.CreatePlaylist(ref playlist);
     PlaylistList.Add(playlist);
 }
 public void DeletePlaylist(Playlist playlist)
 {
     QueryManager.DeletePlaylist(playlist);
     PlaylistList.Remove(playlist);
 }
 public void SelectPlaylist(Playlist playlist)
 {
     PopulateSongList(playlist);
 }