public static void UseInternalSystem() { InternalSystem internalSystem = new InternalSystem(); Director robert = new Director("159.753.398-04"); robert.Name = "Robert"; robert.Password = "******"; AccountManager caroline = new AccountManager("326.985.628-89"); caroline.Name = "Caroline"; caroline.Password = "******"; CommercialPartner commercialPartner = new CommercialPartner(); commercialPartner.Password = "******"; internalSystem.LogInto(robert, "123"); internalSystem.LogInto(caroline, "abc"); internalSystem.LogInto(commercialPartner, "123456"); }