a

 string url = "http://www.baidu.com/index.htm";
            System.Net.WebRequest wReq = System.Net.WebRequest.Create(url);
            System.Net.WebResponse wResp = wReq.GetResponse();
            System.IO.Stream respStream = wResp.GetResponseStream();
            string html = string.Empty;
            using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.Default))
            {
                html= reader.ReadToEnd();
            }
            Response.Write(html);