ArcGISWindowsPhoneSDK.DynamicLayerCode.ChangeLayerOrder_Click C# (CSharp) Method

        private void ChangeLayerOrder_Click(object sender, System.EventArgs e)
        {
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDrawingOptions = null;

            DynamicLayerInfoCollection myDynamicLayerInfos = (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).DynamicLayerInfos;
            if (myDynamicLayerInfos == null)
                myDynamicLayerInfos = (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).CreateDynamicLayerInfosFromLayerInfos();

            var aDynamicLayerInfo = myDynamicLayerInfos[0];
            myDynamicLayerInfos.RemoveAt(0);
            myDynamicLayerInfos.Add(aDynamicLayerInfo);

            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).DynamicLayerInfos = myDynamicLayerInfos;
            (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).VisibleLayers = null;
            // Changing VisibleLayers will refresh the layer, otherwise an explicit call to Refresh is needed.
            //(MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).Refresh();
        }