public ActionResult DetailsGroup(int?id) { if (id == null) { return(HttpNotFound()); } Group group = groupManager.GetGroupByID(id.Value); if (group == null) { return(HttpNotFound()); } GroupSubjects subject = new GroupSubjects(); subject.Id = id.Value; subject.Name = group.Name; subject.Subjects = groupsubjManager.GetSubjectsByGroupID(id.Value); return(View(subject)); }