public ActionResult ModifyTeachers(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            EducationViewModel education = new EducationViewModel()
            {
                Education = db.Educations.Find(id),
                AvailableTeachers = db.Teachers
            };

            education.SelectedTeachers = education.Education.Teachers;

            if (education == null)
            {
                return HttpNotFound();
            }

            return View(education);
        }
        public ActionResult ModifyRooms(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            EducationViewModel education = new EducationViewModel()
            {
                Education = db.Educations.Find(id),
                AvailableRooms = db.Rooms
            };

            if (education == null)
            {
                return HttpNotFound();
            }

            education.SelectedRooms = education.Education.Rooms;

            return View(education);
        }