方法一：

        string url_s = " ";

        WebRequest request_o = WebRequest.Create(url_s);

        HttpWebResponse response_o = (HttpWebResponse)request_o.GetResponse();

        Stream html_o = response_o.GetResponseStream();

        StreamReader reader_o = new StreamReader(html_o, System.Text.Encoding.Default);

        string html_s = reader_o.ReadToEnd();

        reader_o.Close();

        html_o.Close();

        response_o.Close();

        Response.Write(Server.HtmlEncode( html_s));

    方法二：

              WebClient wc = new WebClient();

            wc.Credentials = CredentialCache.DefaultCredentials;

            Stream resStream = wc.OpenRead(web);

            StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);

            code = sr.ReadToEnd();

            resStream.Close();

              ------------------------------

              WebClient wc = new WebClient();

            wc.Credentials = CredentialCache.DefaultCredentials;

            wc.Headers.Set("User-Agent", "Microsoft Internet Explorer");//增加的代码伪装

            Stream resStream = wc.OpenRead(web);

            StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);

            code = sr.ReadToEnd();

            resStream.Close();