private void detach_Song_to_Playlists(Song_to_Playlist entity)
 {
     this.SendPropertyChanging();
     entity.Song = null;
 }
 private void attach_Song_to_Playlists(Song_to_Playlist entity)
 {
     this.SendPropertyChanging();
     entity.Playlist = this;
 }
 partial void UpdateSong_to_Playlist(Song_to_Playlist instance);
 partial void DeleteSong_to_Playlist(Song_to_Playlist instance);
 partial void InsertSong_to_Playlist(Song_to_Playlist instance);