//delete booking
        private void btnDeleteBooking_Click(object sender, RoutedEventArgs e)
        {
            Booking bBooking = new Booking();

            if (lblhello.Content != null)
            {
                int bookingid = Convert.ToInt16(lblhello.Content);

                //find which booking has to be deleted
                foreach (Booking b in aCustomer.BookingsList)
                {
                    if (bookingid == b.BookingID)
                    {
                        bBooking = b;
                    }
                }

                aCustomer.BookingsList.Remove(bBooking);
                dataLayerSingleton.deleteBooking(bookingid);

                MessageBox.Show("Don't forget to UPDATE INFORMATION before going to next page.");

                //clear boxes
                lblBookingStartDate.Content = "";
                lblBookingEndDate.Content   = "";
                lblhello.Content            = "";

                //remove booking from listbox
                lstBoxBookings.Items.Remove(bookingid);

                btnDeleteBooking.IsEnabled = false;
            }
            else
            {
                MessageBox.Show("Nah nah");
            }
        }