static void Main(string[] args) { String choice; CustomerService _customerService = new CustomerService(); FlightService _flightService = new FlightService(); do { Console.WriteLine("------------------------MENU---------------------"); Console.WriteLine("1. Create flights \n" + "2. Create customers \n" + "3. Add customers to flight \n" + "4. Book flight for customer \n" + "5. Search flight \n" + "6. Search customer \n" + "7. Get all flight informations \n" + "8. Get all customer information \n" + "9. Exit "); choice = Console.ReadLine(); choice.Trim(); switch (choice) { case Constants.CREATE_FLIGHT: _flightService.GetFlightInfo(listOfFlight); break; case Constants.CREATE_CUSTOMER: _customerService.GetCustomerInfo(listOfCustomer); break; case Constants.ADD_CUSTOMER: _flightService.AddCustomer(listOfFlight); break; case Constants.ADD_FLIGHT: _customerService.AddFlight(listOfCustomer); break; case Constants.SEARCH_FLIGHT: _flightService.SearchFlight(listOfFlight); break; case Constants.SEARCH_CUSTOMER: _customerService.SearchCustomer(listOfCustomer); break; case Constants.GET_ALL_FLIGHT: _flightService.PrintFlight(listOfFlight); break; case Constants.GET_ALL_CUSTOMER: _customerService.PrintCustomers(listOfCustomer); break; default: choice = Constants.EXIT; break; } } while (!choice.Equals(Constants.EXIT)); }