View source trang web bằng C#

Tạo phương thức ReadHTMLCode(string URL)

private string ReadHTMLCode(string URL)
   {
            try
            {
                 WebClient webClient = new WebClient();
                byte[] reqHTML;
                 reqHTML = webClient.DownloadData(URL);
                  UTF8Encoding objUTF8 = new UTF8Encoding();
                return objUTF8.GetString(reqHTML);
            }
            catch (Exception Ex)
              {
                MessageBox.Show(Ex.Message,"Unable to open file from URL");
            }
            return "error";
   }