private void Window_Loaded(object sender, RoutedEventArgs e)
{
//Import configuration into temporary variables
lDay = new ObservableCollection <Day>(UserData.getDays());
//Intitialize user control values
lvDays.ItemsSource = lDay;
}
public static void WorkdayEnd(DateTime EndTime)
{
//Store the ended workday in the workday history
List <Day> lTemp = UserData.getDays();
lTemp.Add(new Day(UserData.getWorkTimeStart(), EndTime));
UserData.setDays(lTemp);
//Set all workday related parameters to Zero
UserData.setWorkTimeStart(DateTime.MinValue);
}