4. Add the code:

In the code window, type the code below into the Sub Button1_Click. (This is what runs when the button is clicked.) You may need to scroll down towards the

bottom of the code to find the place to add the below code, looking for the words ‘Add code for Lesson 1 here’.To get the full experience of developing with Visual Basic Express – including the use of features such as IntelliSense – we recommend you type the code from this guide rather than copying and pasting it.

That said, if constrained for time you can also copy and paste into the Visual Basic Express code window, although this will reduce the experience you gain from working with the code directly.

If _invApp.Documents.Count = 0 Then

MsgBox("Need to open an Assembly document")

Return

End If

If _invApp.ActiveDocument.DocumentType <> _

DocumentTypeEnum.kAssemblyDocumentObject Then

MsgBox("Need to have an Assembly document active")

Return