using System;

/*

​

THis is to display events based on whether a transaction is placed or not.

​

​

​

*/

public class Program

{

    public static void Main()

    {

        Account acc = new Account(1000);

        acc.TransactionEvent += new TransactionHandler(SendNotification);

        //one event should be fired 

        acc.Credit(400);

        //second event should be fired

        acc.Debit(800);

    }

    public static void SendNotification(object sender,TransactionEventArgs args)

    {

        Console.WriteLine("Event Occured: Amount: "+args.Amount+" Balance: "+args.Balance);

    }

}

    public delegate void TransactionHandler(object sender, TransactionEventArgs args);

​

    public class Account{

        public event TransactionHandler TransactionEvent;

        private decimal _balance;

        public Account(decimal balance)

        {

            _balance=balance;

        }

        public void Debit(int amount)

        {

            _balance-=amount;

            var args=new TransactionEventArgs();

            args.Amount=amount;

            args.Balance=_balance;

            OnTransactionEventRaised(args);

        }

        public void Credit(decimal amount)

        {

            _balance+=amount;

            var args= new TransactionEventArgs();

            args.Amount=amount;

            args.Balance=_balance;

            OnTransactionEventRaised(args);

        }

        public void OnTransactionEventRaised(TransactionEventArgs e)

        {

            if(TransactionEvent !=null)

            {

                TransactionEvent(this,e);

            }

        }

    }

    public class TransactionEventArgs:EventArgs{

        public decimal Balance{get;set;}

        public decimal Amount{get;set;}

        public string TransactionType{get;set;}

    }

​