ArcGISWindowsPhoneSDK.GeometryJSON.ApplyButton_Click C# (CSharp) Method

        private void ApplyButton_Click(object sender, RoutedEventArgs e)
        {
            ClearGraphicsLayers();
            OutJsonTextBox.Text = "";

            try
            {
                // Convert from Geometry to ArcGIS REST geometry json
                Geometry geometry = Geometry.FromJson(InJsonTextBox.Text);

                Graphic graphic = new Graphic();

                if (geometry is MapPoint)
                    graphic.Symbol = LayoutRoot.Resources["RedMarkerSymbol"] as SimpleMarkerSymbol;
                else if (geometry is Polyline)
                    graphic.Symbol = LayoutRoot.Resources["RedLineSymbol"] as SimpleLineSymbol;
                else if (geometry is Polygon)
                    graphic.Symbol = LayoutRoot.Resources["RedFillSymbol"] as SimpleFillSymbol;
                else if (geometry is Envelope)
                    graphic.Symbol = LayoutRoot.Resources["RedFillSymbol"] as SimpleFillSymbol;

                if (graphic.Symbol != null)
                {
                    graphic.Geometry = geometry;
                    _myFromJsonGraphicsLayer.Graphics.Add(graphic);
                }
            }
            catch
            {
                MessageBox.Show("Unable to convert json into geometry");
            }
        }