ArcGISWindowsPhoneSDK.DynamicLayerCode.reset_Click C# (CSharp) Method

        private void reset_Click(object sender, System.EventArgs e)
        {
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDrawingOptions = null;
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).VisibleLayers = null;
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).DynamicLayerInfos = null;
            // Changing VisibleLayers will refresh the layer, otherwise an explicit call to Refresh is needed.
            // Call Refresh in case VisibileLayers was already null
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).Refresh();
        }