todd.patterson,

todd.patterson wrote
> I use the close command for the document 

Yes, you close the document but I don't see you closing any of the
PdfReaders or the PdfWriter, neither explicitely nor implicitely (e.g. by
utilizing a using statement). iText in the latest 10...15 releases more and
more stopped to do close calls itself as that disturbs some use cases, e.g.
when pages from a single document are imported in multiple other documents.

Furthermore your code is essentially merging source PDFs as is into a single
destination PDF. Using PdfWriter is not the optimal way to implement that;
if you used some Pdf*Copy* variant instead, you wouldn't have to deal with
all this page size and page orientation stuff, interactive features would be
copied, too, as good as possible, and the resulting PDF would internally be
better organized (not immediate a problem, but trouble might ensue if that
process is repeated multiple times).

You might want to read the (freely available) chapter 6 of iText in Action,
2nd edition, especially the later sections.

Regards,   Michael



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