static void Main(string[] args) { Academy p = new Academy("UCL", "Seebladsgade"); Student s1 = new Student(p, "Jens"); Student s2 = new Student(p, "Niels"); Student s3 = new Student(p, "Susan"); p.Attach(s1); p.Attach(s2); p.Attach(s3); p.Message = "Så er der julefrokost!"; p.Detach(s2); p.Message = "Så er der fredagsbar!"; Console.ReadLine(); }