using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine("Welcome to Online Shopping portal");

        StartEventTrigger("1001","Gym Gloves",2000,5);

    }

    public static void StartEventTrigger(string itemIdIP,string nameIP,double priceIP, int stockInHandIP)

    {

        Order orderObj=new Order();

        Item itemObj =new Item(orderObj);

        Console.WriteLine("---------------------Product Stock Check---------------------------");

        MyEventArgs e1=new MyEventArgs();

        e1.ItemId=itemIdIP;

        e1.Name=nameIP;

        e1.Price=priceIP;

        e1.StockInHand=stockInHandIP;

        Console.WriteLine("ItemID is {0}",e1.ItemId);

        Console.WriteLine("Product Name is {0} ", e1.Name);

        Console.WriteLine("Price is {0} ", e1.Price);

        Console.WriteLine("Stock left {0}",e1.StockInHand);

        if(e1.StockInHand<=5)

        {

            orderObj.RefillRequestEvent(e1);

            Console.WriteLine("Refill Request raised ");

        }

        else

        {

            Console.WriteLine("No need for Refill request for {0}",e1.Name);

        }

    }

}

public class MyEventArgs : EventArgs

{

    public string ItemId;

    public string Name;

    public double Price;

    public int StockInHand;

}

​

public class Item

{

    public string ItemId{get;set;}

    public string Name{get;set;}

    public double Price{get;set;}

    public int StockInHand{get;set;}

    public void OnHandler(object sender,MyEventArgs e)

    {

        Console.WriteLine("Refill request raised for Product : {0}",e.Name);

    }

    public Item(Order OrderObj)

    {

        MyHandler d1=new MyHandler(OnHandler);

        OrderObj.Event+=d1;

    }

}

​

public class Order

{

    public event MyHandler Event;

    public void RefillRequestEvent(MyEventArgs e)

    {

        if(Event!=null)

        {

            Event(this,e);

        }

    }

}

​

public delegate void MyHandler(object sender,MyEventArgs e);