public static void Main() { var userProfile = new UserProfile(); var validationDecorator = new ValidationDecorator(userProfile); // with invalid input try { validationDecorator.Username = "******"; } catch (ArgumentException e) { Console.WriteLine(e.Message); } try { validationDecorator.Password = "******"; } catch (ArgumentException e) { Console.WriteLine(e.Message); } // with valid input validationDecorator.Username = "******"; validationDecorator.Password = "******"; Console.WriteLine("Username: "******"Password: "******"ivan"; } catch (ArgumentException e) { Console.WriteLine(e.Message); } try { encryptionDecorator.Password = "******"; } catch (ArgumentException e) { Console.WriteLine(e.Message); } encryptionDecorator.Username = "******"; encryptionDecorator.Password = "******"; Console.WriteLine("Username: "******"Encrypted password: " + userProfile.Password); }