ArcGISWindowsPhoneSDK.ServiceAreas.ClearButton_Click C# (CSharp) Method

        private void ClearButton_Click(object sender, EventArgs e)
        {
            foreach (Layer layer in MyMap.Layers)
                if (layer is GraphicsLayer)
                    (layer as GraphicsLayer).Graphics.Clear();

            (ApplicationBar.Buttons[0] as IApplicationBarIconButton).IsEnabled = false;

            pointBarriers.Clear();
            polylineBarriers.Clear();
            polygonBarriers.Clear();
        }