public bool getweb(string strURL,out string buf)

  {

   buf="";

   try

   {

    //Uri url=new Uri(strURL,false);

    HttpWebRequest request;

    request = (HttpWebRequest)WebRequest.Create(strURL);

    request.Method="POST"; //Post请求方式

    request.ContentType="text/html;charset=gb2312"; //内容类型

    string paraUrlCoded = System.Web.HttpUtility.UrlEncode(""); //参数经过URL编码

    byte[] payload;

    payload = System.Text.Encoding.GetEncoding("GB2312").GetBytes(paraUrlCoded); //将URL编码后的字符串转化为字节

    request.ContentLength = payload.Length; //设置请求的ContentLength

    Stream writer = request.GetRequestStream(); //获得请求流

    writer.Write(payload,,payload.Length); //将请求参数写入流

    writer.Close(); //关闭请求流

    HttpWebResponse response;

    response = (HttpWebResponse)request.GetResponse(); //获得响应流

    Stream s;

    s = response.GetResponseStream();

    StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));

    string HTML = "";

    string sLine ="";

    int i = ;

    while (sLine!=null)

    {

     i++;

     sLine = objReader.ReadLine();

     if (sLine!=null)

      HTML += sLine;

    }

    //HTML = HTML.Replace("&lt;","<");

    //HTML = HTML.Replace("&gt;",">");

    buf=HTML;

    return true;

   }

   catch (Exception x)

   {

    buf=x.Message.ToString();

    return false;

   }

  }