Add a reference to 'Microsoft Word 9.0 Object Library'

I'm trying to print a document with this code:
Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

    Dim wrdApp As New Word.Application

    wrdApp.Documents.Open("C:\temp\temp.doc")

    wrdApp.Dialogs.Item(Word.WdWordDialog.wdDialogFilePrint).Show()

    wrdApp.Visible = False

    wrdApp.ActiveDocument.Close()

    wrdApp.Quit()

End Sub
The problem is, when the print dialog shows up and I click OK to print, I get the Message 'Word is currently printing. Quitting Word will cancel all pending print jobs. Do you want to quit Word?'

If I click Yes the document is not printed but Word disappears. Clicking No, the document prints but the Word application is still open and has to be closed manually.

Is there a way to tell when the Word app is fininished sending the document to the printer so I can call wrdApp.Quit()?