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;
            }
        }