下载某个网站的内容

WebRequest req = WebRequest.Create("http://www.123cha.com/ip/?q=15804888888");
WebResponse result = req.GetResponse();
Stream ReceiveStream = result.GetResponseStream();
StreamReader readerOfStream = new StreamReader(ReceiveStream,System.Text.Encoding.GetEncoding("UTF-8"));
string aa = readerOfStream.ReadToEnd();
aa = aa.Remove(0,aa.IndexOf("[其他参考数据]: "));
aa = aa.Remove(aa.IndexOf("[查询提供]"));
aa = aa.Remove(0, 10);
aa = aa.ToLower();
aa = aa.Remove(aa.IndexOf("<br>"));
this.textBox1.Text = aa;
ReceiveStream.Close();