using System;

public class Program

{

    public static void Main()

    {

            Order order = new Order();

            order.PlaceOrder();           

    }

}

​

class Order

    {

        public void PlaceOrder()

        {

            Console.WriteLine("Place Order Started");

            Product product = new Product();

            product.GetProductDetails();

            Payment payment = new Payment();

            payment.MakePayment();

            Invoice invoice = new Invoice();

            invoice.Sendinvoice();

            Console.WriteLine("Order Placed Successfully");

        }

}

​

class Product

    {

        public void GetProductDetails()

        {

            Console.WriteLine("Fetching the Product Details");

        }

    }

​

class Payment

    {

        public void MakePayment()

        {

            Console.WriteLine("Payment Done Successfully");

        }

    }

​

class Invoice

    {

        public void Sendinvoice()

        {

            Console.WriteLine("Invoice Send Successfully");

        }

    }

​