public void DisplayMainMenu() { Console.WriteLine("Welcome to The Bank Application Project \n \n"); Console.WriteLine("Please enter option from the list :- \n"); Console.WriteLine("1. Create a Bank"); Console.WriteLine("2. Login for Staff / Account holder"); Console.WriteLine("3. Save and Exit"); int res = Convert.ToInt32(Console.ReadLine()); BankServices bankServices = new BankServices(bankData); switch (res) { case 1: Console.WriteLine("Registereing a new bank"); bankServices.RegisterBank(); break; case 2: DisplayLoginMenu(); break; case 3: Console.WriteLine("Option 3 is under work !"); break; default: Console.WriteLine("Please select a valid option !!"); DisplayMainMenu(); break; } }