public void StartTimer_Click(object sender, RoutedEventArgs e)
{
var timeSpan = GettimeSpanFromTimer();
Parent.ChoosenTimeSpan = timeSpan;
OperationsOnInternalData.SaveTimeSpanToFile(timeSpan);
}
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
base.OnClosing(e);
OperationsOnInternalData.SaveTimeSpanToFile(GettimeSpanFromTimer());
e.Cancel = true;
this.Hide();
}
