VB.NET - Lock a word document using vb net

I am trying lock a word document using vb.net . Anyone know how to do this?

Although I don't know the exact code this tip might be more helpful then the code to do it.  

Open your word document.  Go to macro builder and set the recorder to record your actions which should include protecting or locking the document.  

Then stop the recorder and go to the Macro sub menu and select the Edit code selection.  

You will now see all the code you need.  If you don't see it right away keep opening and closing the project view on the left side till you see it.  If you need to open the word object tell me but I am assuming you know how to do that.  

Here is the code I got from building a macro
Sub Macro1()
'
' Macro1 Macro
' Macro recorded 5/15/2006 by '
    ActiveDocument.TrackRevisions = Not ActiveDocument.TrackRevisions
    Selection.TypeText Text:="adfadfasdf"
    ActiveDocument.Protect Password:="1234", NoReset:=False, Type:= _
        wdAllowOnlyRevisions

Good Luck

Dim bWord As New Word.Application
                bWord.Documents.Open(careGiverOutputPath + dt.Rows(counter)(0) + ".doc")
                bWord.ActiveDocument.Protect(Word.WdProtectionType.wdAllowOnlyFormFields)
                bWord.ActiveDocument.Save()
                bWord.Quit()