public IActionResult CreateClassAJAX(ClassModel classModel)
        {
            ClaimsPrincipal currentUser   = this.User;
            string          currentUserId = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value;
            var             access        = new SqlDataAccess();

            if (ModelState.IsValid)
            {
                access.CreateClass(classModel.className, classModel.classSubject, currentUserId);
                return(RedirectToAction("Index"));
            }
            return(View("Index"));
        }