static DeviceList()
 {
     DeviceList.Current = new DeviceList();
     DeviceList.Current.InitDeviceWatcher();
     
     // Register for app suspend/resume handlers
     App.Current.Suspending += new SuspendingEventHandler(DeviceList.Current.SuspendDeviceWatcher);
     App.Current.Resuming += DeviceList.Current.ResumeDeviceWatcher;
 }