Obsługa zdarzeń w C#

using System;
using System.Drawing;
using System.Windows.Forms;
 
public class notepad : Form
{

    Button ok = new Button();
    TextBox text = new TextBox();

    static public void Main ()
    {
        Application.Run (new notepad ());
    }
 
    public notepad()
    {
        this.Size = new Size(400,200);
        this.StartPosition = FormStartPosition.CenterScreen;

        ok.Size = new Size(64,64);
        ok.Location = new Point(10,10);
        ok.Click += new EventHandler(ok_click);
        ok.Text = "OK";
        this.Controls.Add(ok);
        text.Size = new Size(164,64);
        text.Location = new Point(100,10);
        text.Font = new Font(text.Font.FontFamily,24);
        this.Controls.Add(text);
  
    }
    private void ok_click(object sender, EventArgs e)
    {
            if (text.Text == "9999")
            {
            MessageBox.Show("TOP SECRET"); 
            }


    }

}