public void CreateMyMenu()
    {
    // Set the caption for the top-level menu item.
    menuItem1.Text = "Edit";
    // Set the caption for the first submenu.
    menuItem2.Text = "Font Size";
    // Set the caption for menuItem2's first submenu.
    menuItem3.Text = "Small";
    // Set the checked property to true since this is the default value.
    menuItem3.Checked = true;
    // Define a shortcut key combination for the menu item.
    menuItem3.Shortcut = Shortcut.CtrlS;
    // Set the caption of the second sub menu item of menuItem2.
    menuItem4.Text = "Large";
    // Define a shortcut key combination for the menu item.
    menuItem4.Shortcut = Shortcut.CtrlL;
    // Set the index of the menu item so it is placed below the first submenu item.
    menuItem4.Index = 1;
    // Add menuItem3 and menuItem4 to menuItem2's list of menu items.
    menuItem2.MenuItems.Add(menuItem3);
    menuItem2.MenuItems.Add(menuItem4);
    // Add menuItem2 to menuItem1's list of menu items.
    menuItem1.MenuItems.Add(menuItem2);
    // Add menuItem1 to the MainMenu for displaying.
    mainMenu1.MenuItems.Add(menuItem1);
    }

//引入命名空间
using System;
using System.Drawing;
using System.Windows.Forms;
   
class OldFashionedMenu: Form
{
     MainMenu mmMain, mmFile, mmEdit;
   
     public static void Main()
     {
          Application.Run(new OldFashionedMenu());
     }
     public OldFashionedMenu()
     {
          EventHandler eh = new EventHandler(MenuOnClick);
   
          mmMain = new MainMenu(new MenuItem[] 
          { 
               new MenuItem("MAIN:"),
               new MenuItem("&File", new EventHandler(MenuFileOnClick)),
               new MenuItem("&Edit", new EventHandler(MenuEditOnClick))
          });
   
          mmFile = new MainMenu(new MenuItem[]
          {
               new MenuItem("FILE:"),
               new MenuItem("&New", eh),
               new MenuItem("&Open...", eh),
               new MenuItem("&Save", eh),
               new MenuItem("Save &As...", eh),
               new MenuItem("(&Main)", new EventHandler(MenuMainOnClick))
          });
          
          mmEdit = new MainMenu(new MenuItem[]
          {
               new MenuItem("EDIT:"),
               new MenuItem("Cu&t", eh),
               new MenuItem("&Copy", eh),
               new MenuItem("&Paste", eh),
               new MenuItem("De&lete", eh),
               new MenuItem("(&Main)", new EventHandler(MenuMainOnClick))
          });
   
          Menu = mmMain;
     }
     void MenuMainOnClick(object obj, EventArgs ea)
     {
          Menu = mmMain;
     }
     void MenuFileOnClick(object obj, EventArgs ea)
     {
          Menu = mmFile;
     }
     void MenuEditOnClick(object obj, EventArgs ea)
     {
          Menu = mmEdit;
     }
     void MenuOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("Menu item clicked!", Text);
     }
}

//引入命名空间
using System;
using System.Drawing;
using System.Windows.Forms;
   
class FirstMainMenu: Form
{
     public static void Main()
     {
          Application.Run(new FirstMainMenu());
     }
     public FirstMainMenu()
     {

          MenuItem miOpen = new MenuItem("&Open...",
                                   new EventHandler(MenuFileOpenOnClick),
                                   Shortcut.CtrlO);
   
          MenuItem miSave = new MenuItem("&Save",
                                   new EventHandler(MenuFileSaveOnClick),
                                   Shortcut.CtrlS);
   
          MenuItem miSaveAs = new MenuItem("Save &As...",
                                   new EventHandler(MenuFileSaveAsOnClick));
   
          MenuItem miDash = new MenuItem("-");
   
          MenuItem miExit = new MenuItem("E&xit",
                                   new EventHandler(MenuFileExitOnClick));
          MenuItem miFile = new MenuItem("&File",
                                   new MenuItem[] {miOpen, miSave, miSaveAs,
                                                   miDash, miExit });
          MenuItem miCut = new MenuItem("Cu&t",
                                   new EventHandler(MenuEditCutOnClick),
                                   Shortcut.CtrlX);
   
          MenuItem miCopy = new MenuItem("&Copy",
                                   new EventHandler(MenuEditCopyOnClick),
                                   Shortcut.CtrlC);
   
          MenuItem miPaste = new MenuItem("&Paste",
                                   new EventHandler(MenuEditPasteOnClick),
                                   Shortcut.CtrlV);
          MenuItem miEdit = new MenuItem("&Edit",
                                   new MenuItem[] {miCut, miCopy, miPaste});
   
          MenuItem miAbout = new MenuItem("&About FirstMainMenu...",
                                   new EventHandler(MenuHelpAboutOnClick));
          MenuItem miHelp = new MenuItem("&Help", 
                                   new MenuItem[] {miAbout});
   
          Menu = new MainMenu(new MenuItem[] {miFile, miEdit, miHelp});
     }
     void MenuFileOpenOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("File Open item clicked!", Text);
     }
     void MenuFileSaveOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("File Save item clicked!", Text);
     }
     void MenuFileSaveAsOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("File Save As item clicked!", Text);
     }
     void MenuFileExitOnClick(object obj, EventArgs ea)
     {
          Close();
     }
     void MenuEditCutOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("Edit Cut item clicked!", Text);
     }
     void MenuEditCopyOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("Edit Copy item clicked!", Text);
     }
     void MenuEditPasteOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show("Edit Paste item clicked!", Text);
     }
     void MenuHelpAboutOnClick(object obj, EventArgs ea)
     {
          MessageBox.Show(Text + " ?");
     }
}