static void Main(string[] args) { Person person = new Person(); AddressBookUtility addressBookUtility = new AddressBookUtility(); int flag = 0; do { Console.WriteLine("Enter your choice 1.ADD 2.Display 3.Edit 4.Delete 5.SortByName 6.SortByCity 7.SortByState 8.SortByZip 9.View person by city 10.View Person by State 11.Exit"); int choice = Convert.ToInt32(Console.ReadLine()); switch (choice) { case 1: addressBookUtility.AddPerson(); break; case 2: addressBookUtility.DisplayPerson(); break; case 3: addressBookUtility.EditPerson(); break; case 4: addressBookUtility.DeletePerson(); break; case 5: addressBookUtility.SortByName(); break; case 6: addressBookUtility.SortByCity(); break; case 7: addressBookUtility.SortByState(); break; case 8: addressBookUtility.SortByZip(); break; case 9: addressBookUtility.ViewCity(); break; case 10: addressBookUtility.ViewState(); break; case 11: flag = 1; break; } } while (flag == 0); }