public async Task <IActionResult> Index()
        {
            OverViewModel model = new OverViewModel();

            model.DepCount = await dep.CountDepartmentAsync();

            model.ClassCount = await classe.CountClass(null);

            model.StudentCount = await stu.CountStudentAsync();

            model.TeacherCount = await th.CountTeacherAsync();

            return(View(model));
        }