private string GetUrlHTML(string url)
  {
   string GetContext;
   GetContext="";
   HttpWebRequest GetWebRequest;
   HttpWebResponse GetWebResponse;
   GetWebRequest=(HttpWebRequest)System.Net.WebRequest.Create(url);
   GetWebResponse = (HttpWebResponse)GetWebRequest.GetResponse();
   if(GetWebResponse.StatusCode == HttpStatusCode.OK)
   {
      Stream GetStream = GetWebResponse.GetResponseStream();
      StreamReader GetStreamReader;
      GetStreamReader = new StreamReader(GetStream,System.Text.Encoding.GetEncoding("GB2312"));
      GetContext = GetStreamReader.ReadToEnd();
      GetStreamReader.Close();
   }
   return GetContext;
  }