WebRequest

WebRequest req = WebRequest.Create("http://www.ucasp.net");
         WebResponse result = req.GetResponse();
         Stream ReceiveStream = result.GetResponseStream();
      

         Byte[] read = new Byte[int.Parse(result.ContentLength.ToString())];
         int bytes = ReceiveStream.Read(read, 0, int.Parse(result.ContentLength.ToString()));
         Encoding encode = System.Text.Encoding.GetEncoding("gb2312");//编码方式 
            string text=encode.GetString(read,0, int.Parse(result.ContentLength.ToString()));