public ActionResult RemoveDisplayQuarter(QuarterItemModel entity)
        {
            ScheduleManager manager = new ScheduleManager();

            if (manager.RemoveDisplayQuarter(entity.DisplayQuarterID))
            {
                return RedirectToAction("ManageQuarters");
            }
            else
            {
                var model = manager.GetQuarterItemFromId(entity.DisplayQuarterID);
                return View(model);
            }
        }