private void GetUserLocation()
 {
     try
     {
         var systemInfo = new ActiveDs.ADSystemInfo();
         var siteName   = systemInfo.SiteName;
         UserLocation = !string.IsNullOrEmpty(siteName) ? siteName : "UNKNOWN";
         if (UserLocation == "VPN")
         {
             if (IpAddress == "")
             {
                 GetIpAddress();
             }
             if (IpAddress.StartsWith("172.30.56"))
             {
                 UserLocation = "LON";
             }
         }
     }
     catch
     {
         UserLocation = "UNKNOWN";
     }
 }