public static void Main() { try { School softUni = new School("SoftUni"); Student student1 = new Student("Test1", "a123", "some details"); Student student2 = new Student("Test2", "a12"); Discipline discipline = new Discipline("PHP", 10, "Enter details here"); discipline.AddStudents(student1, student2); Teacher teacher = new Teacher("Angel", "Teacher details"); teacher.AddDisciplines(discipline, discipline, discipline); Class classB1 = new Class("B1", "This is class details."); classB1.AddStudents(student1, student2); classB1.AddTeachers(teacher); softUni.AddClasses(classB1); Console.WriteLine(softUni); } catch (ArgumentException ex) { Console.WriteLine(ex.Message); } }