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 })); }