windows uwp怎確認網站是否可存取

   try
   {
       var request = WebRequest.Create("https://tw.yahoo.com");
       request.Timeout = 5000;
       request.Method = "HEAD";

       using (var response = (HttpWebResponse)request.GetResponse())
       {
           String s = response.StatusCode.ToString();
           response.Close();
           return s.Equals(System.Net.HttpStatusCode.OK.ToString());
       }
   }
   catch (System.Net.WebException exception)
   {
       return false;
   }