public IActionResult StudentInfo(Student student)
        {
            if (ModelState.IsValid)
            {
                StudentViewModel svm = new StudentViewModel();

                if (student.StudentId == 0)
                {
                    svm.AddStudent(student);
                }
                else
                {
                    svm.UpdateStudent(student);
                }

                return(RedirectToAction("Index", "Site"));
            }
            return(View());
        }