winform menustrip的遍曆

我這個是設定指定的菜單為不可用，是在許可權控制的時候，我遍曆了一下。 

 private void CheckSubMenu(ToolStripMenuItem menuItem, string MenuItemName)
        {
            if (menuItem.Text.Equals(MenuItemName))
            {
                menuItem.Enabled = false;
            }
            for (int i = 0; i < menuItem.DropDownItems.Count; i++)
            {
                if (menuItem.DropDownItems[i] is ToolStripSeparator)
                {
                    continue;
                }
                else
                {
                    CheckSubMenu((ToolStripMenuItem)menuItem.DropDownItems[i], MenuItemName);
                }
            }
        }

        private void CheckMenu(MenuStrip Menu,string MenuItemName)
        {
            foreach (ToolStripMenuItem n in Menu.Items)
            {
                CheckSubMenu(n,MenuItemName);
            }
        }

  紅字部分，我本來是用的的foreach迴圈如下：

       foreach(ToolStripMenuItem  m    in   menuItem.DropDownItems)

         {

              CheckSubMenu(m,MenuItemName);

         }

  但一測試過後發現我的菜單裡有ToolStripSeparator這個很討厭，所以沒辦法就改成for迴圈，加了是否ToolStripSeparator的判斷