Locate a user (ASP.Net) using ipinfodb.com

GeoLocateVisitor.cs

  string ip = Request.ServerVariables["X-Forwarded-For"]
      
   public class LocationInfo
    {
        public string Country { get; set; }
        public string RegionName { get; set; }
        public string City { get; set; }
        public string ZipCode { get; set; }
        public float Latitude { get; set; }
        public float Longitude { get; set; }
    }
     public static LocationInfo HostIpToPlaceName(string ip)
        {
            ObjectCache cache = MemoryCache.Default;
            var key = "zzzzzgetyourowncodezzzzzz";
            string url = "http://api.ipinfodb.com/v3/ip-city/?key={0}&ip={1}&format=xml";
            
            url = String.Format(url,key, ip);
            var location = new LocationInfo();
            var result = cache[ip] as XDocument;
            try
            {
                if (result == null)
                {
                    result = XDocument.Load(url);
                    cache.Add(ip, result,
                   new CacheItemPolicy() { SlidingExpiration = TimeSpan.FromDays(1) });
                }
          location = (from x in result.Descendants("Response")
                      select new LocationInfo
                    {
                     City = (string)x.Element("cityName"),
                     RegionName = (string)x.Element("regionName"),
                     Country = (string)x.Element("countryName"),
                     ZipCode = (string)x.Element("zipCode"),
                     Latitude = (float)x.Element("latitude"),
                     Longitude = (float)x.Element("longitude")
                    }).First();
            return location;
        }
    }