How to use delegate Event in C#.net

How to Use Delegate Event in C#.NET

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace DELEGATE_EVENT

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        //first create class

        public class Amount

        {

            int amount=0;

            //create delegate

            public delegate void bankdelegate(int oldbal, int newbal);

            //create two events

            public event bankdelegate OnDeposit;

            public event bankdelegate OnWithDraw;

            //create two methods

            public void Deposit(int a)

            {

                OnDeposit(this.amount, this.amount + a);// call event

                this.amount += a;

            }

            public void WithDraw(int a)

            {

                OnWithDraw(this.amount, this.amount - a);

                this.amount -= a;

            }

        }

        //create ref of class

        public Amount amount=null;

        private void btndeposit_Click(object sender, EventArgs e)

        {

            amount.Deposit(Convert.ToInt32(txtamount.Text));

            

          

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        

              amount=new Amount();

            //load event On form Load

            amount.OnDeposit +=new Amount.bankdelegate(amount_OnDeposit);

            amount.OnWithDraw +=new Amount.bankdelegate(amount_OnWithDraw);

        }

        //create function

        public void amount_OnDeposit(int oldbal, int newbal)

        {

            lbloldvalance.Text = oldbal.ToString();

            lblnewbalance.Text = newbal.ToString();

        }

        public void amount_OnWithDraw(int oldbal, int newbal)

        {

            lbloldvalance.Text = oldbal.ToString();

            lblnewbalance.Text = newbal.ToString();

        }

        private void btnwithdraw_Click(object sender, EventArgs e)

        {

           

            amount.WithDraw(Convert.ToInt32(txtamount.Text));

        }

    }

}