private void Form1_Load(object sender, EventArgs e)
{
  //添加菜單一 
  ToolStripMenuItem subItem;
  subItem = AddContextMenu("入庫", menuStrip1.Items, null);
  //添加子菜單 
  AddContextMenu("添加入庫", subItem.DropDownItems, new EventHandler(MenuClicked));
  AddContextMenu("入庫管理", subItem.DropDownItems, new EventHandler(MenuClicked));
  //添加菜單二 
  subItem = AddContextMenu("出庫", menuStrip1.Items, null);
  //添加子菜單 
  AddContextMenu("添加出庫", subItem.DropDownItems, new EventHandler(MenuClicked));
  AddContextMenu("出庫管理", 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(fā)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(tài)生成事件并打開窗體
　　　　//((sender as ToolStripMenuItem).Tag)強制轉(zhuǎn)換
  ObjectHandle t = Activator.CreateInstance("WinForms", "WinForms.Form2");
  Form f = (Form)t.Unwrap();
  f.ShowDialog();
}