asp.net 提取URL页面内容

 private void Button1_Click(object sender, System.EventArgs e)
  {
   string PageUrl = UrlText.Text;
   System.Net.WebClient wc = new System.Net.WebClient();
   wc.Credentials = System.Net.CredentialCache.DefaultCredentials;

   ///方法一：
   Byte[] pageData = wc.DownloadData(PageUrl);
   ContentHtml.Text = System.Text.Encoding.Default.GetString(pageData);

   /// 方法二：
   /// ***************代码开始**********
   /// Stream resStream = wc.OpenRead(PageUrl);
   /// StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);
   /// ContentHtml.Text = sr.ReadToEnd();
   /// resStream.Close();
   /// **************代码结束********
   ///
   wc.Dispose(); 

 

  }

  private void Button2_Click(object sender, System.EventArgs e)
  {
   string PageUrl = UrlText.Text;
   System.Net.WebRequest  request = System.Net.WebRequest.Create(PageUrl);
   System.Net.WebResponse response = request.GetResponse();
   System.IO.Stream resStream = response.GetResponseStream(); 
   System.IO.StreamReader sr = new System.IO.StreamReader(resStream, System.Text.Encoding.Default);
   ContentHtml.Text = sr.ReadToEnd();
   resStream.Close();
   sr.Close();

  }
 }
}