static void Main(string[] args)
        {
            string             prodPath = System.Environment.GetEnvironmentVariable("BANGAZON_CLI_DB");
            DatabaseConnection db       = new DatabaseConnection(prodPath);

            DatabaseStartup databaseStartup = new DatabaseStartup(db);
            MainMenu        menu            = new MainMenu();
            CustomerManager cm = new CustomerManager(db);

            int choice;

            // When the user enters the system show the main menu
            do
            {
                choice = menu.Show();

                switch (choice)
                {
                case 1:
                    // Displays the Create Customer Menu
                    CreateCustomer.CreateCustomerMenu(cm);
                    break;
                }
            }while (choice != 9);
            menu.Show();
        }