using System;

using System.Collections.Generic;

​

namespace ConsoleApplication4

{

    public class Program

    {

        public static void Main()

        {

            Queue<Customer> custQueue = new Queue<Customer>();

​

            custQueue.Enqueue(new Customer("Suren","Dhakal"));

            custQueue.Enqueue(new Customer("Baik","Sigdel"));

            custQueue.Enqueue(new Customer("Santosh", "Chalise"));

            custQueue.Enqueue(new Customer("Satyaraj", "Adhikari"));

            custQueue.Enqueue(new Customer("Lila", "Nyaupane"));           

​

            while (custQueue.Count >0)

                {

                    Customer nextCustomer = custQueue.Dequeue();

                    Table table = new Table();

​

                    table.TableEvent += nextCustomer.TableOpenEventListener;

                    table.TableOpenEvent();

​

                    while (nextCustomer.myMeal != Customer.Meals.done)

                    {

                        nextCustomer.CustomerEvent += CustomerMealEventListener;

                        nextCustomer.myNextMeal();

                        nextCustomer.CustomerEvent -= CustomerMealEventListener;

                    }

                    table.TableEvent -= nextCustomer.TableOpenEventListener;                   

                }

​

            Console.WriteLine("Everyone is Full!");

            Console.ReadLine();

        }

        public static void CustomerMealEventListener(object sender, CustomerEventArgs e)

        {

            if(e.customer.myMeal!=Customer.Meals.done)

                Console.WriteLine("{0} {1} is having {2}.", e.customer.FirstName, e.customer.LastName, e.customer.myMeal); 

            else

            {

                Console.WriteLine("{0} {1} is {2}.", e.customer.FirstName, e.customer.LastName, e.customer.myMeal);

                Console.WriteLine();

            }

        }

​

    }

    public class Table

    {       

        public event TableEventHandler TableEvent;

​

        public void TableOpenEvent()

        {

            Console.WriteLine("Table is open!");

            TableEventHandler table = TableEvent;

            if (TableEvent != null)

            {

                table(this, new TableEventArgs(this));

            }

        }

    }

​

    public class Customer

    {

        public string FirstName { get; set; }

        public string LastName { get; set; }

​

        public enum Meals { none, appetizer, main, desert, done };

​

        public Meals myMeal {get; set;}

        public event CustomerEventHandler CustomerEvent;

​

​

        public Customer(string fName, string lName)

        {

            FirstName = fName;

            LastName = lName;

            myMeal = Meals.none;

        }

​

        public void TableOpenEventListener(object sender, TableEventArgs e)

        {

            Console.WriteLine("{0} {1} got a table.", this.FirstName, this.LastName);

        }

        public void myNextMeal()

        {

            CustomerEventHandler nextMealInfo = CustomerEvent;

            if(myMeal!=Meals.done)

                myMeal += 1;

            if(nextMealInfo!=null)            

                nextMealInfo(this, new CustomerEventArgs(this));

        }

    }

​

    public delegate void TableEventHandler(object sender, TableEventArgs e);

    public delegate void CustomerEventHandler(object sender, CustomerEventArgs e);

​

    public class TableEventArgs : EventArgs

    {

        public Table table { get; set; }

        public TableEventArgs(Table t)

        {

            this.table = t;

​

        }

    }

​

    public class CustomerEventArgs : EventArgs

    {

        public Customer customer { get; set; }

        public CustomerEventArgs(Customer c)

        {

            this.customer = c;

​

        }

    }

​

}

​