I use PDF Docu Driver to save files during printing inside a VB.NET application.

I tried to print some files for example:
fileA.txt,fileB.doc,fileC.jpg respectively to a file
named allFiles.pdf

but unfortunately, fileA.txt takes a long time to save to allFiles.pdf and fileB.doc is now queued together with fileA.txt.

so the printer queue now contains fileA.txt and fileB.doc respectively.

but since fileB.doc just contains little txt it prints ahead of fileA.txt.

and when it does that, an error is shown that it cannot find allFiles.pdf.

i think allFiles.pdf is still used by PDF Driver to save  fileA.txt to pdf but fileB.doc is starting already to print and also uses allFiles.pdf
maybe that's the problem/bug.

2.
Also, does PDF Printer Driver follow a First Come First Serve where first on the queue will be printed first then second and so forth?