通过WebRequest 类来获取远端页面。

   //设定您要取得得页面地址给url
   string url = "http://www.cnblogs.com";
   Uri contentUrl = new Uri(url);
   WebRequest req = WebRequest.Create(contentUrl);
   //设定为默认的认证方法
   req.Credentials = CredentialCache.DefaultCredentials;

   WebResponse resp = req.GetResponse();
   Stream stream = resp.GetResponseStream();
   StreamReader sr = new StreamReader(stream);
   this.textBox2.Text  = sr.ReadToEnd();
   sr.Close();