/// <summary>
        /// get country and city
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static List<string> IPGetCity(string ip)
        {
            var country = "";
            var city = "";
            var list = new List<string>();
            try
            {
                WebClient MyWebClient = new WebClient();
                MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据  
                Byte[] pageData = MyWebClient.DownloadData("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=" + ip); //从指定网站下载数据  
                string pageHtml = Encoding.Default.GetString(pageData);
                dynamic data = Newtonsoft.Json.JsonConvert.DeserializeObject(pageHtml);
                if (pageHtml.Contains("country")&& pageHtml.Contains("city"))
                {
                    country = data.country;
                    city = data.city;
                }
                list.Add(country);
                list.Add(city);
                return list;
            }
            catch (Exception ex)
            {
                list.Add(country);
                list.Add(city);
                return list;
            }
        }