public ActionResult SaveCredits(Subject subject) { subjectService = new SubjectService(); if (subject == null) { return(RedirectToAction("Index")); } if (subject.ID == 0) { return(RedirectToAction("Index")); } if (!subjectService.ChangeCredits(subject.ID, subject.Credits)) { return(RedirectToAction("EditCredits", new { id = subject.ID })); } return(RedirectToAction("Index", "Course")); }