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After creating the menu, we will add the listbox and write the code to insert items in the listbox.

Add a ListBox. Leave the name listbox1. Make sure the top is below the menu and make it a bit bigger.
(We will add code to resize the listbox when the form is resized later.)

Write the code as shown below:

Private Sub mnuInsert_Click(sender As Object, e As EventArgs) Handles mnuInsert.Click
        'Add an item to the list box
        Dim s As String
        s = InputBox("Enter item", "Add Item")
        If s <> "" Then
            ListBox1.Items.Add(s)
        End If
    End Sub

See the complete code at this point.

NEXT: Build the Menu