public async Task Parse(RssSource rssSource)
        {

            var _UserAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)";
            httpClient.DefaultRequestHeaders.Add("user-agent", _UserAgent);

            var response = await httpClient.GetStringAsync(rssSource.Url);

            XNamespace xmlns = "http://www.w3.org/2005/Atom";
            XNamespace media = "http://search.yahoo.com/mrss/";

            XDocument Feed = XDocument.Parse(response);

            string group = rssSource.Group.Length > 1 ? rssSource.Group : Feed.Descendants("channel").Select(e => (string)e.Element("title").Value).First();

            IEnumerable<Item> items = new List<Item>();

            if (rssSource.Url.StartsWith("http://gdata.youtube.com/feeds/api/playlists/"))  //parse Youtube Playlist RSS 
            {
                //0 is link, 1 is image, 2 is title, 3 is description
                string youtubeHtmlTemplate = "<p><a href=\"{0}\"><img src=\"{1}\" alt=\"\" width=300></a></p><p><a style=\"font-size: 15px; font-weight: bold; font-decoration: none;\" href=\"{0}\">{2}</a></p><p>{3}</p>";

                items = from item in Feed.Descendants("item")
                        select new Item()
                        {
                            Title = item.Element("title").Value,
                            Subtitle = item.Element("pubDate").Value,
                            Description = item.Descendants(media + "thumbnail").Count() > 0 ? string.Format(youtubeHtmlTemplate, item.Element("link").Value, item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault(), item.Element("title").Value, item.Element("description").Value.Substring(0, Math.Min(580, item.Element("description").Value.Length))) : string.Empty,
                            Image = item.Descendants(media + "thumbnail") != null ? item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault() : string.Empty,
                            Group = @group,
                        };

                items = items.Where(x => x.Description != string.Empty);
            }
            else
            {
                string audio_template = "<audio src=\"{0}\" controls autoplay>Your browser does not support the <code>audio</code> element.<br/><a href=\"{0}\">Link to file</a>.</audio><br/>";
                var feeditems = AppSettings.RssMaxItemsPerFeed < 0
                    ? Feed.Descendants("item")
                    : Feed.Descendants("item").Take(AppSettings.RssMaxItemsPerFeed);
                items = from item in feeditems
                        select new Item()
                        {
                            Title = item.Element("title") != null ? item.Element("title").Value : string.Empty,
                            Subtitle = item.Element("pubDate") != null ? item.Element("pubDate").Value : string.Empty,
                            Description =
                                // TODO: perhaps this needs to use the url's MIME type to determine the tag for audio, video, PDFs, etc.?
                                  (item.Element("enclosure") != null
                                    ? string.Format(audio_template, (string)(item.Element("enclosure").Attribute("url")))
                                    : string.Empty)
                                + (item.Element("description") != null
                                    ? (string)(item.Element("description").Value)
                                    : string.Empty),
                            Image = item.Descendants(media + "thumbnail") != null ? item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault() : "",
                            Group = @group,
                        };
            }

            if (items.ToList().Count > 0)
            {

                foreach (var item in items)
                {
                    if (item.Image == null) //Attempt to parse an image out of the description if one is not returned in the RSS
                        item.Image = Regex.Match(item.Description, "(https?:)?//?[^'\"<>]+?.(jpg|jpeg|gif|png)").Value;

                    //Format dates to look cleaner
                    DateTime dateTimeResult = new DateTime();
                    if (DateTime.TryParse(item.Subtitle, out dateTimeResult))
                        item.Subtitle = dateTimeResult.ToString("ddd, d MMM yyyy");

                    RssData.Add(item);
                };
            }
            else
            {
                await ServiceLocator.MessageService.ShowErrorAsync("Zero items retrieved from " + rssSource.Url, "Application Error");
            }
        }
        public async Task Parse(RssSource rssSource)
        {

            var _UserAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)";
            httpClient.DefaultRequestHeaders.Add("user-agent", _UserAgent);

            var response = await httpClient.GetStringAsync(rssSource.Url);

            XNamespace xmlns = "http://www.w3.org/2005/Atom";
            XNamespace media = "http://search.yahoo.com/mrss/";

            XDocument Feed = XDocument.Parse(response);

            string group = rssSource.Group.Length > 1 ? rssSource.Group : Feed.Descendants("channel").Select(e => (string)e.Element("title").Value).First();

            IEnumerable<Item> items = new List<Item>();

            if (rssSource.Url.StartsWith("http://gdata.youtube.com/feeds/api/playlists/"))  //parse Youtube Playlist RSS 
            {
                //0 is link, 1 is image, 2 is title, 3 is description
                string youtubeHtmlTemplate = "<div style=\"color: #000000;font-family: Arial, Helvetica, sans-serif;     font-size:12px; font-size: 12px; width: 555px;\"><table cellspacing=\"0\" cellpadding=\"0\" border=\"0\"><tbody><tr><td width=\"140\" valign=\"top\" rowspan=\"2\"><div style=\"border: 1px solid #999999; margin: 0px 10px 5px 0px;\"><a href=\"{0}\"><img alt=\"\" src=\"{1}\"></a></div></td><td width=\"256\" valign=\"top\"><div style=\"font-size: 12px; font-weight: bold;\"><a style=\"font-size: 15px; font-weight: bold; font-decoration: none;\" href=\"{0}\">{2}</a><br></div><div style=\"font-size: 12px; margin: 3px 0px;\"><span>{3}</span></div></td>";

                items = from item in Feed.Descendants("item")
                        select new Item()
                        {
                            Title = item.Element("title").Value,
                            Subtitle = item.Element("pubDate").Value,
                            Description = item.Descendants(media + "thumbnail").Count() > 0 ? string.Format(youtubeHtmlTemplate, item.Element("link").Value, item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault(), item.Element("title").Value, item.Element("description").Value.Substring(0, Math.Min(580, item.Element("description").Value.Length))):string.Empty,
                            Image = item.Descendants(media + "thumbnail") != null ? item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault() : string.Empty,
                            Group = @group,
                        };

                items = items.Where(x => x.Description != string.Empty);
            }
            else
            {
                string audio_template = "<audio src=\"{0}\" controls autoplay>Your browser does not support the <code>audio</code> element.</audio><br/>";
                items = from item in Feed.Descendants("item")
                        select new Item()
                        {
                            Title = item.Element("title") != null ? item.Element("title").Value : string.Empty,
                            Subtitle = item.Element("pubDate") != null ? item.Element("pubDate").Value : string.Empty,
                            Description =
                                // TODO: perhaps this needs to use the url's MIME type to determine the tag for audio, video, PDFs, etc.?
                                  ( item.Element("enclosure") != null
                                    ? string.Format(audio_template, (string)(item.Element("enclosure").Attribute("url")))
                                    : string.Empty )
                                + ( item.Element("description") != null
                                    ? (string)(item.Element("description").Value)
                                    : string.Empty ),
                            Image = item.Descendants(media + "thumbnail") != null ? item.Descendants(media + "thumbnail").Select(e => (string)e.Attribute("url")).FirstOrDefault() : "",
                            Group = @group,
                        };
            }

            if (items.ToList().Count > 0)
            {

                foreach (var item in items)
                {
                    if (item.Image == null) //Attempt to parse an image out of the description if one is not returned in the RSS
                        item.Image = Regex.Match(item.Description, "(https?:)?//?[^'\"<>]+?.(jpg|jpeg|gif|png)").Value;

                    RssData.Add(item);
                };
            }
            else
            {
                await ServiceLocator.MessageService.ShowErrorAsync("Zero items retrieved from " + rssSource.Url, "Application Error");
            }
        }