출처 : 본인

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;

using System.Reflection;

namespace test

{

public partial class Form1 : Form

{

TestClass t = new TestClass();

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

t.ChangedIndexCnt += new EventHandler(ChangeItem);

}

private void ChangeItem(object sender, EventArgs e)

{

MessageBox.Show("값이 변경되었어요!");

MessageBox.Show(t.IndexCnt.ToString());

}

private void button1_Click(object sender, EventArgs e)

{

//IndexCnt 값 확인

MessageBox.Show(t.IndexCnt.ToString());

}

private void button2_Click(object sender, EventArgs e)

{

//IndexCnt 값 변경

t.IndexCnt = 0;

}

private void button3_Click(object sender, EventArgs e)

{

//IndexCnt 값 변경

t.IndexCnt = 11;

}

}

public class TestClass

{

public event EventHandler ChangedIndexCnt;

private int indexCnt;

public int IndexCnt

{

get { return this.indexCnt; }

set

{

if (this.indexCnt != value)

{

this.indexCnt = value;

ChangedIndexCnt(this, EventArgs.Empty);

}

}

}

}

}

C# Event 처리 예제