static void Main(string[] args) { Menu menu = new Menu(); StudentJournal journal = new StudentJournal(); journal.EnteringStudentName(); while (true) { switch (menu.MenuItemSelection()) { case 1: journal.AddSubject(); break; case 2: int numberOfSubject = menu.SubjectMenuItemSelection(journal.subjects); Subject subject = journal.subjects[numberOfSubject]; subject.AddMark(); break; case 3: ShowStatistic(menu, journal); break; case 4: return; default: menu.ShowInvalidMenuItenText(); break; } } }