Output PDF file handle not getting released

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Am using the QuickPDF library to generate thumbnail in VB.NET/VS2008/.NET2.0. Code below. 

After thumbnail is created when user tries to view the actual pdf file ... many a times am getting the message from Adobe PDF Reader  "There was an error opening this document. This file is already open or in use by another application.". Sounds like the QuickPDF library is not releasing the file-handle. 

 Question: Is their anyway to dispose of the QuickPDF object guaranteed .. this way the adobe reader will get a clean read. Thanks@

' Create Image using QuickPDF
Dim QP As QuickPDFAX0715.PDFLibrary
Dim Result As Integer
Dim lngFileHandle As Long
Dim pageRef As Long
Dim imageConversionResult As Integer
QP = New QuickPDFAX0715.PDFLibrary
Result = QP.UnlockKey("license-key")
lngFileHandle = QP.DAOpenFile("C:\my.pdf", "")
pageRef = QP.DAFindPage(lngFileHandle, 1)
imageConversionResult = QP.DARenderPageToFile(lngFileHandle, pageRef, 5, 75, "C:\my.png")
QP = Nothing

Edited by bob123 - 14 Sep 09 at 5:58PM