public static string GetHTML(string url)
        {
            ASCIIEncoding encoding = new ASCIIEncoding();
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
            myRequest.Method = "GET";
            myRequest.ContentType = "text/html;";
            myRequest.UserAgent = "Mozilla/5.0 (Windows NT 5.2; rv:14.0) Gecko/20100101 Firefox/14.0.1";
            myRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8";
            myRequest.KeepAlive = true;
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            string content = reader.ReadToEnd();
            return content;
        }

public string GetHTML2(string url) {
  WebClient wc = new WebClient();
  wc.Credentials = CredentialCache.DefaultCredentials;
  byte[] btPageData = wc.DownloadData(url);
  string strTargetHtml = Encoding.UTF8.GetString(btPageData);
  wc.Dispose();
  return strTargetHtml;
}