ArcGISWindowsPhoneSDK.SOEElevationDataContract.MyMap_MouseClick C# (CSharp) Метод

        private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {
            MapPoint geographicPoint = _mercator.ToGeographic(e.MapPoint) as MapPoint;

            string SOEurl = "http://sampleserver4.arcgisonline.com/ArcGIS/rest/services/Elevation/ESRI_Elevation_World/MapServer/exts/ElevationsSOE/ElevationLayers/1/GetElevationAtLonLat";
            SOEurl += string.Format(System.Globalization.CultureInfo.InvariantCulture, "?lon={0}&lat={1}&f=json", geographicPoint.X, geographicPoint.Y);

            WebClient webClient = new WebClient();

            webClient.OpenReadCompleted += (s, a) =>
            {
                DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(ElevationSOELatLon));
                ElevationSOELatLon elevationSOELatLon = serializer.ReadObject(a.Result) as ElevationSOELatLon;
                a.Result.Close();

                MyInfoWindow.Anchor = e.MapPoint;
                MyInfoWindow.Content = string.Format("Elevation: {0} meters", elevationSOELatLon.Elevation.ToString("0"));
                MyInfoWindow.IsOpen = true;
            };

            webClient.OpenReadAsync(new Uri(SOEurl));
        }