public Playlists GetPlaylists(string userId)
        {
            string    url       = string.Format("https://api.spotify.com/v1/users/{0}/playlists?", userId);
            Playlists playlists = _spotifyApi.GetSpotifyType <Playlists>(url);

            return(playlists);
        }
        public List <string> GetPlaylistsName(string userId)
        {
            Playlists playLists = GetPlaylists(userId);

            List <string> playlistNames = new List <string>();

            foreach (var playlist in playLists.Items)
            {
                playlistNames.Add(playlist.Name);
            }

            return(playlistNames);
        }