How to convert this code to UWP way?

private async void Parsing(string website)
       {
           try
           {
               HttpClient http = new HttpClient();
               var response = await http.GetByteArrayAsync(website);
               String source = Encoding.GetEncoding("utf-8").GetString(response, 0, response.Length - 1);
               source = WebUtility.HtmlDecode(source);
               HtmlDocument resultat = new HtmlDocument();
               resultat.LoadHtml(source);

               List<HtmlNode> toftitle = resultat.DocumentNode.Descendants().Where
               (x => (x.Name == "div" && x.Attributes["class"] != null && x.Attributes["class"].Value.Contains("block_content"))).ToList();

               var li = toftitle[6].Descendants("li").ToList();
               foreach (var item in li)
               {
                   var link = item.Descendants("a").ToList()[0].GetAttributeValue("href", null);
                   var img = item.Descendants("img").ToList()[0].GetAttributeValue("src", null);
                   var title = item.Descendants("h5").ToList()[0].InnerText;

                   listproduct.Add(new Product()
                   {
                       Img = img,
                       Title = title,
                       Link = link
                   });
               }

           }
           catch (Exception)
           {

               MessageBox.Show("Network Problem!");
           }

       }