public Student AddStudent(Student student)
        {
            StudentDao = new StudentDao();

            int isStudentAdded = StudentDao.AddStudent(student);

            if (isStudentAdded == 1) return student;

            return null;
        }
        public List<Student> GetStudents()
        {
            StudentDao = new StudentDao();

            return StudentDao.GetStudents();
        }
        public Student GetStudent(string studentId)
        {
            StudentDao = new StudentDao();

            return StudentDao.GetStudent(studentId);
        }