File enqueue problem in ASP.NET

Intermittently, the method below causes the following error in ASP.NET. 

"The process cannot access the file "somefile.gif" because it is being used by another process." 

At the time this method executes there are no other processes (that I know of) accessing the file.  The problem is occurring on a single-user development machine.

All I am trying to do is get an image of the first page of a PDF file and save it as a thumbnail in a gif file.  The problem does not occur every time, but it is recreatable.

Any advice appreciated.

-Grant

***************************************************

Friend Sub UpdateImageFiles()

'Semantics:

' Assuming the existance of a PDF file for this raw file page, create/overwrite the image file

' used in tagging.

Dim codecs As New Leadtools.Codecs.RasterCodecs

Dim image As Leadtools.IRasterImage

Dim resizeCommand As New Leadtools.ImageProcessing.ResizeCommand

'Load the PDF file

image = codecs.Load(PDFPath)

resizeCommand.Flags = RasterSizeFlags.Normal

resizeCommand.DestinationImage = New RasterImage(RasterMemoryFlags.Managed, _

image.Width / SMALL_IMAGE_RATIO, _

image.Height / SMALL_IMAGE_RATIO, _

image.BitsPerPixel, _

image.Order, _

image.ViewPerspective, _

image.Palette, _

Nothing)

resizeCommand.Run(image)

File.Delete(SmallImagePath)

codecs.Save(resizeCommand.DestinationImage, SmallImagePath, RasterImageFormat.Gif, 0, 1, 1, 1, _

CodecsSavePageMode.Overwrite)

codecs = Nothing

resizeCommand = Nothing

image.Dispose()

image = Nothing

To my understanding, you run the code repeatedly overwriting the same
GIF file.  Try deleting the file (if it exists) before
saving.  Also, you might want to try the latest patch for v14 or
14.5 .NET (depending on the version you have) and see if that changes anything.