ArcGISWindowsPhoneSDK.Difference.Difference C# (CSharp) Method

        public Difference()
        {
            InitializeComponent();

            geometryService =
                        new GeometryService("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

            geometryService.DifferenceCompleted += GeometryService_DifferenceCompleted;
            geometryService.SimplifyCompleted += GeometryService_SimplifyCompleted;
            geometryService.Failed += GeometryService_Failed;

            inputGraphicsLayer = MyMap.Layers["InputGraphicsLayer"] as GraphicsLayer;

            MyDrawObject = new Draw(MyMap)
                {
                    DrawMode = DrawMode.Polygon,
                    IsEnabled = false,
                    FillSymbol = LayoutRoot.Resources["DrawFillSymbol"] as ESRI.ArcGIS.Client.Symbols.FillSymbol
                };
            MyDrawObject.DrawComplete += MyDrawObject_DrawComplete;
        }