public extras load_extras(int booking_ref)
        {
            sql             = "SELECT * FROM extras WHERE booking_ref='" + booking_ref + "';";
            cmd.CommandText = sql;
            sdr             = cmd.ExecuteReader();
            extras extra = new extras();

            while (sdr.Read())
            {
                if (booking_ref == Int32.Parse(sdr.GetString(7)))
                {
                    extra.Ref                = Int32.Parse(sdr.GetString(0));
                    extra.Breakfast_price    = Double.Parse(sdr.GetString(1));
                    extra.Breakfast_num      = Int32.Parse(sdr.GetString(2));
                    extra.Evening_meal_price = Double.Parse(sdr.GetString(3));
                    extra.Evening_meal_num   = Int32.Parse(sdr.GetString(4));
                    extra.Car_hire_price     = Double.Parse(sdr.GetString(5));
                    extra.Car_hire_start     = sdr.GetString(6);
                    extra.Car_hire_end       = sdr.GetString(7);
                    extra.Car_hire_name      = sdr.GetString(8);
                    extra.BookingRef         = Int32.Parse(sdr.GetString(9));
                }
            }
            sdr.Close();
            return(extra);

            Extras extraWin = new Extras();

            extraWin.Show();

            //extraWin.txtBox_extras_ref.Text = extra.Ref.ToString();
            extraWin.txtBox_booking_ref.Text   = booking_ref.ToString();
            extraWin.txtBox_breakfast.Text     = extra.Breakfast_num.ToString();
            extraWin.txtBox_evening_meal.Text  = extra.Evening_meal_num.ToString();
            extraWin.datepicker_start.Text     = extra.Car_hire_start;
            extraWin.datepicker_end.Text       = extra.Car_hire_end;
            extraWin.txtBox_car_hire_name.Text = extra.Car_hire_name;
            if (extraWin.datepicker_start.Text == "0001-01-01")
            {
                extraWin.datepicker_start.Text = "";
            }
            if (extraWin.datepicker_end.Text == "0001-01-01")
            {
                extraWin.datepicker_end.Text = "";
            }
        }