网页登陆显示登录人IP归属地的功能

   /// <summary>
        /// 获取IP归属地
        /// </summary>
        /// <param name="Ip">IP地址</param>
        /// <returns></returns>
        public string GetIpAddRess(string Ip)
        {
            WebRequest request = WebRequest.Create("http://www.ip138.com/ips138.asp?ip=" + Ip);
            WebResponse response = request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gb2312"));
            string read = reader.ReadToEnd();
            Regex regex = new Regex("<td align=\"center\"><ul class=\"ul1\"><li>本站主数据：(?<title>.*?)</li>");
            if (regex.IsMatch(read))
            {
                read = regex.Match(read).Groups["title"].Value;
               
            }
            return read;
        }