public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        int ticksCount = 0;

        private void OnTick(object sender, EventArgs e)
        {
            ticksCount++;
            Debug.Print(ticksCount.ToString());
        }

        private async void Button_Click(object sender, RoutedEventArgs e)
        {
            var dispatcherTime = new DispatcherTimer(TimeSpan.FromSeconds(1.0), DispatcherPriority.Background, OnTick, Dispatcher.CurrentDispatcher);
            var currentTime = DateTime.Now;
            await Task.Delay(TimeSpan.FromSeconds(5.0));
            Debug.Print("Begin");
            while (DateTime.Now < currentTime + TimeSpan.FromSeconds(10.0))
            {

            }
            Debug.Print("End");
        }
    }