public IActionResult DeleteStudent(int studentId)
        {
            if (!_repo.StudentExists(studentId))
            {
                return(NotFound());
            }
            var studentToDelete = _repo.GetStudent(studentId);

            _repo.DeleteStudent(studentToDelete);
            if (!_repo.Save())
            {
                return(StatusCode(500, $"A problem happened while handling your request to create a Student with id: {studentId}."));
            }

            return(NoContent());//success
        }