public ActionResult EditTeacher(TeacherEditTeacherVM model)
        {
            if (!ModelState.IsValid)
            {
                model.TitleList = TeacherTitle();
                return View(model);
            }
            UnitOfWork unitOfWork = new UnitOfWork();
            UserRepository<Teacher> teacherRepo = new UserRepository<Teacher>(unitOfWork);
            TitleRepository tiRepo = new TitleRepository(unitOfWork);

            Teacher teacher = teacherRepo.GetByID(model.TeacherID);

            try
            {
                int TitleId = Convert.ToInt32(model.selectedValueID);
                Title title = tiRepo.GetByID(TitleId);

                if (model.FirstName != teacher.FirstName || model.LastName != teacher.LastName || model.Active != teacher.Active || TitleId != teacher.Title.ID)
                {
                    teacher.FirstName = model.FirstName;
                    teacher.LastName = model.LastName;
                    teacher.Username = model.FirstName;
                    teacher.Active = model.Active;
                    teacher.Title = title;

                    teacherRepo.Save(teacher);
                    unitOfWork.Commit();
                }
            }
            catch (Exception)
            {
                unitOfWork.RollBack();
            }
            return RedirectToAction("ListTeachers", "Teacher");
        }
        public ActionResult EditTeacher(int id)
        {
            TeacherEditTeacherVM model = new TeacherEditTeacherVM();
            TitleRepository titleRepo = new TitleRepository();
            List<SelectListItem> list = new List<SelectListItem>();
            UserRepository<Teacher> teacherRepo = new UserRepository<Teacher>();

            Teacher teacher = teacherRepo.GetByID(id);

            var teacherTitle = titleRepo.GetByID(teacher.Title.ID);

            list.Add(new SelectListItem() { Text = teacherTitle.Name, Value = teacherTitle.ID.ToString() });
            var title = titleRepo.GetAll();

            foreach (var item in title)
            {
                if (item.ID != teacher.Title.ID)
                {
                    list.Add(new SelectListItem() { Text = item.Name, Value = item.ID.ToString() });
                }

            }
            model.FirstName = teacher.FirstName;
            model.LastName = teacher.LastName;
            model.Active = teacher.Active;
            model.TeacherID = teacher.ID;
            model.TitleList = list;

            return View(model);
        }