.net 通过Url获取站点json数据

今天要做一个查找IP是否是国内的，找到了淘宝的API接口，之前是用ajax来获取数据的，这次使用后台代码。之后在序列化为json格式的数据，代码如下：

  //判断ip是否是中国
        private bool IsCount()
        {
            bool result = true;
            string _requestUrl = "http://ip.taobao.com/service/getIpInfo.php?ip=203.49.243.0";
           
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_requestUrl);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();


            var serializer = new JavaScriptSerializer();
            var ret = serializer.Deserialize<IpCountry>(retString);
            if(ret.data.country!="中国")
            {
                result = false;
            }
            return result;
        }
        
    }
    class IpCountry
    {
        public string code{get;set;}
        public DataCoun data { get; set; }
    }
    class DataCoun
   {
        public string country { get; set; }
        public string country_id { get; set; }
        public string ip { get; set; }
   }