public ActionResult CancelSchedule(int id)
        {
            Schedule schedule = db.getScheduleById(id);

            db.CancelSchedule(id);
            db.CancelledScheduleRefund(id);
            List <Yoga_User> list = db.getScheduleSignUpList(schedule.Schedule_Id);

            if (list.Count >= 1)
            {
                EmailSender.ClassCancelledEmail(list, schedule);
            }

            return(RedirectToAction("ScheduleList"));
        }