public async Task <IActionResult> AddMark(newMark NewMark)
{
NewMark.TheMark.Student = await _student.GetStudentByIdAsync(NewMark.TheMark.Student.Id);
NewMark.TheMark.Subject = _manager.GetSubjectByName(NewMark.TheMark.Subject.SubjectName);
_manager.AddMark(NewMark.TheMark);
return(RedirectToAction("StudentDetail", new { id = NewMark.TheMark.Student.Id }));
}
