public ActionResult AddGradeToSchool(ModifySchoolGradeRequest request)
        {
            var university = _schoolService.GetSchoolById(request.UniversityId);
            var model = new NewUniversityViewModel()
            {
                UniversityId = university.SchoolId,
                UniversityName = university.Name,
                UniversityDescription = university.Description
            };

            model.Response = (ResponseMessageViewModel) request.Validate();
            if (!request.IsValid)
            {
                model.UpdateGradeList();
                return PartialView("~/Views/Partials/Management/AddGrade.cshtml", model);
            }

            _schoolService.AddGradeToSchool(request.UniversityId, request.SchoolGrade);
            model.UpdateGradeList();
            return PartialView("~/Views/Partials/Management/AddGrade.cshtml", model);
        }
        public ActionResult DeleteGradeFromSchool(ModifySchoolGradeRequest request)
        {
            _schoolService.RemoveGradeFromSchool(request.UniversityId, request.SchoolGrade);
            var school = _schoolService.GetSchoolById(request.UniversityId);

            NewUniversityViewModel model = new NewUniversityViewModel()
            {
                UniversityId = school.SchoolId,
                UniversityName = school.Name,
                UniversityDescription = school.Description,
            };

            model.UpdateGradeList();

            return PartialView("~/Views/Partials/Management/AddGrade.cshtml", model);
        }