Bing Maps - Reverse Geocoding

function reverseGeocodeRequest() {
          var latitude = document.getElementById('txtLatitude').value;
          var longitude = document.getElementById('txtLongitude').value;
          createSearchManager();
          var userData = { name: 'Maps Test User', id: 'XYZ' };
          map.setView({ zoom: 10 });
          var request =
          {
              location: new Microsoft.Maps.Location(latitude, longitude),
              callback: onReverseGeocodeSuccess,
              errorCallback: onReverseGeocodeFailed,
              userData: userData
          };
          searchManager.reverseGeocode(request);
      }