public partial class FormMkTest : Form
    {
        public FormMkTest()
        {
            InitializeComponent();
        }

        private void FormMkTest_Load(object sender, EventArgs e)
        {
            //添加菜單一文本中加入 &F  即ALT+F  打開某子菜單
            ToolStripMenuItem subItem;
            subItem = AddContextMenu("文件(&F)", menuStrip1.Items, null);
            //添加子菜單
            AddContextMenu("打開(&O)", subItem.DropDownItems, new EventHandler(MenuClicked));
            AddContextMenu("下載(&D)", subItem.DropDownItems, new EventHandler(MenuClicked));

            //添加菜單二
            subItem = AddContextMenu("&Edit", menuStrip1.Items, null);
            //添加子菜單
            ToolStripMenuItem sub1 = AddContextMenu("&Update", subItem.DropDownItems, new EventHandler(MenuClicked));
            //孫子
            AddContextMenu("孫子", sub1.DropDownItems, new EventHandler(MenuClicked));
            AddContextMenu("-", subItem.DropDownItems, null);//增加一個分割線
            AddContextMenu("沒有快捷鍵", subItem.DropDownItems, new EventHandler(MenuClicked));

        }
        /// <summary>
        /// 添加子菜單
        /// </summary>
        /// <param name="text">要顯示的文字，如果為 - 則顯示為分割線</param>
        /// <param name="cms">要添加到的子菜單集合</param>
        /// <param name="callback">點擊時觸發的事件</param>
        /// <returns>生成的子菜單，如果為分隔條則返回null</returns>

        ToolStripMenuItem AddContextMenu(string text, ToolStripItemCollection cms, EventHandler callback)
        {
            if (text == "-")
            {
                ToolStripSeparator tsp = new ToolStripSeparator();
                cms.Add(tsp);
                return null;
            }
            else if (!string.IsNullOrEmpty(text))
            {
                ToolStripMenuItem tsmi = new ToolStripMenuItem(text);
                tsmi.Tag = text + "TAG";
                if (callback != null) tsmi.Click += callback;
                cms.Add(tsmi);

                return tsmi;
            }

            return null;
        }
        void MenuClicked(object sender, EventArgs e)
        {
            //以下主要是動態生成事件並打開窗體

            //((sender as ToolStripMenuItem).Tag)強制轉換

            //ObjectHandle t = Activator.CreateInstance("WinForms", "WinForms.Form2");
            //Form f = (Form)t.Unwrap();
            //f.ShowDialog();
            string s = (sender as ToolStripMenuItem).Text;
            MessageBox.Show(s);
        }
    }

menuStrip1動態添加菜單及快捷鍵