public static void GetBook() { Console.WriteLine("Librarian gets the book from the library."); //for getting the book and giving it to the customer switch (NameLibrarian) { case "Robin": Librarian1.SpeedGettingBook(); break; case "Yuri": Librarian2.SpeedGettingBook(); break; default: break; } BookAvailability = false; Customer.HasBook(); BookCustomer = ""; Availability = true; }