public async Task<ActionResult> UpdateWaitlist(string username, int classId, bool accept)
        {
            if(username == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            List<EnrollmentBindingModel> updates = new List<EnrollmentBindingModel>
            {
                new EnrollmentBindingModel { Accept = accept, ClassId = classId, StudentUserName = username }
            };

            EnrollmentManager manager = new EnrollmentManager(db);
            await manager.AcceptEnrollment(updates);

            return RedirectToAction("Waitlist", new { classId = classId });
        }