A MenuItem can only be contained in one menu at a time, and cannot be added more than once to the same menu. To reuse a MenuItem in more than one menu, use the CloneMenu method of the MenuItem class. To remove a MenuItem that you have previously added, use the Remove method.
The following code example uses the derived class MainMenu to create a main menu, mainMenu1, that has two MenuItem objects added to its MenuItems collection. The code then assigns mainMenu1 to the Menu property of the Form. This example requires that the code defined in this example is located with in a form.