WPF C# - Timer countdown

Question

How can I implement the following in my piece of code written in WPF C#?

I have a ElementFlow control in which I have implemented a SelectionChanged event which (by defi

Answer 1

I've figured the complete code out as such:

DispatcherTimer _timer;

public MainWindow()
{
    _myTimer = new DispatcherTimer();
    _myTimer.Tick += MyTimerTick;
    _myTimer.Interval = new TimeSpan(0,0,0,1);
}

private void ElementFlowSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    _counter = 0;
    _myTimer.Stop();
    _myTimer.Interval = new TimeSpan(0, 0, 0, 1);
    _myTimer.Start();
}

private int _counter;
public int Counter
{
    get { return _counter; }
    set
        {
            _counter = value;
            OnPropertyChanged("Counter");
        }
}
private void MyTimerTick(object sender, EventArgs e)
{
    Counter++;
    if (Counter == 2)
    {
        _myTimer.Stop();
        MessageBox.Show(“Reached the 2 second countdown”);
    }
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
    PropertyChangedEventHandler e = PropertyChanged;
    if (e != null)
        {
            e(this, new PropertyChangedEventArgs(propertyName));
}
}