C#.net 이벤트 event

namespace Test
{

public partial class Form : Form
{

public Form()
{

InitializeComponent();

}

UserClass uc;

private void Form_Load(object sender, EventArgs e)
{

uc = new UserClass();

uc.UserMsg+=new EventHandler<UserEventArgs>(uc_UserMsg);

}

void uc_UserMsg(object seder, UserEventArgs e)
{

MessageBox.Show(e.sMessage);

}

private void button1_Click(object sender, EventArgs e)
{

uc.Msg("TEST");

}

}

public class UserEventArgs : System.EventArgs
{

public string sMessage;

public UserEventArgs(string sMessage)

: base()

{

this.sMessage = sMessage;

}

}

class UserClass
{

public event EventHandler<UserEventArgs> UserMsg;

public void Msg(string s)
{

if (UserMsg != null)
UserMsg(this, new UserEventArgs(s));

}

}

}