读取页内容

public string GetContent(string url)
  {
   HttpWebRequest req =(HttpWebRequest)WebRequest.Create(url);
   //req.
   HttpWebResponse res =  (HttpWebResponse)req.GetResponse();
   StreamReader sr = new StreamReader(res.GetResponseStream(),System.Text.Encoding.GetEncoding("gb2312"));
   string content = sr.ReadToEnd();
   //Response.Write(content);
   return content;
  }

  private void btSearch_Click(object sender, System.EventArgs e)
  {
   string url = this.TbUrl.Text.Trim();
   this.tbContent.Text=this.GetContent(url);
  }