Menyer og formkontroll

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;
namespace control8
{
    public partial class Form1 : Form
    {
        ArrayList Cmds = new ArrayList(20);
        public Form1()
        {
            InitializeComponent();
            this.ShowInTaskbar = true;
        }
        private void doToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Cmds.Add(sender.ToString());
            label1.Text = (String)Cmds[Cmds.Count - 1];
        }
        private void undoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (Cmds.Count>0)
                Cmds.RemoveAt(Cmds.Count - 1);
            if (Cmds.Count > 0)
                label1.Text = (String)Cmds[Cmds.Count - 1];
            else
                label1.Text="-";
        }
        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult res = 
                MessageBox.Show(this, 
                                "Vil du virkelig slutte", "Avslutt", 
                                MessageBoxButtons.YesNo);
            if (res == DialogResult.No)
            {
                e.Cancel = true;
            }
        }
     }
}