private void btnAddOrder_Click(object sender, RoutedEventArgs e)
        {
            object selectedObject = lbSelectCustomerList.SelectedItem;

            if (selectedObject == null)
            {
                MessageBox.Show(this, "Geen klant geselecteerd!", "Onvoldoende gegevens", MessageBoxButton.OK, MessageBoxImage.Error);
                return;
            }
            Customer customer        = (Customer)selectedObject;
            DateTime dateTimeOrdered = DateTime.Now;
            DateTime dateTimePickup  = dpPickupDate.SelectedDate.GetValueOrDefault(DateTime.Now);

            dateTimePickup = dateTimePickup.AddHours(timeHours);
            dateTimePickup = dateTimePickup.AddMinutes(timeMinutes);
            Employee employee    = new Employee("iedereen", 1);
            string   description = tbDescription.Text;

            Order order = new Order(customer, dateTimeOrdered, dateTimePickup, employee, description);

            if (access.AddOrder(order))
            {
                MessageBox.Show(this, "Order succesvol toegevoegd!", "Succes", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            else
            {
                MessageBox.Show(this, "Order kon niet toegevoegd worden!", "Fout", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }