ArcGISWindowsPhoneSDK.SymbolJson.UseSymbol C# (CSharp) Method

        private void UseSymbol(string symbolJson)
        {
            try
            {
                Symbol symbol = Symbol.FromJson(symbolJson);

                GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;

                foreach (Graphic g in graphicsLayer.Graphics)
                {
                    if ((g.Geometry is Polygon || g.Geometry is Envelope) && symbol is FillSymbol)
                        g.Symbol = symbol;
                    else if (g.Geometry is Polyline && symbol is LineSymbol)
                        g.Symbol = symbol;
                    else if (g.Geometry is MapPoint && symbol is MarkerSymbol)
                        g.Symbol = symbol;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Deserializing JSON failed", MessageBoxButton.OK);
            }
        }