Obtains all video idst+titles from a playlist by the playlist id

YTPlaylistLinkFactory.cs

  class YTitleIDCollection
    {
        public string videoId { get; set; }
        public string title { get; set; }
    }
    class JSON_PlaylistItems
    {
        public string nextPageToken;
        public Item[] items;

        public class Item
        {
            public ContentDetails contentDetails;
            public Snippet snippet;

            public class ContentDetails
            {
                public string videoId;
            }

            public class Snippet
            {
                public string title;
            }
        }
    }
    class YTPlaylistLinkFactory
    {
        public static string apiKey = "APIKEY";
        public static YTitleIDCollection[] getLinks(string playlistID)
        {
            List<YTitleIDCollection> retval = new List<YTitleIDCollection>();
            WebClient wc = new WebClient();
            wc.Proxy = null;
            string nextToken = null;

            var ytlist = new List<JSON_PlaylistItems.Item>();

            do
            {
                var queryString = new Uri("https://www.googleapis.com/youtube/v3/playlistItems"
                + "?part=contentDetails,snippet"
                + "&maxResults=50"
                + "&playlistId=" + playlistID
                + "&fields=" + Uri.EscapeDataString("items(contentDetails/videoId,snippet/title),nextPageToken")
                + (nextToken != null ? ("&pageToken=" + nextToken) : string.Empty)
                + "&key=" + apiKey);

                string todes = wc.DownloadString(queryString);
                var lel = JsonConvert.DeserializeObject<JSON_PlaylistItems>(todes);
                nextToken = lel.nextPageToken;
                ytlist.AddRange(lel.items);
            } while (nextToken != null);

            foreach (var it in ytlist)
            {
                retval.Add(new YTitleIDCollection() { title = it.snippet.title, videoId = it.contentDetails.videoId });
            }
            return retval.ToArray();
        }
    }