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A:
Yes, you can run PDF/A validation & conversion by using ‘pdftron.PDF.PDFA.PDFACompliance‘ as shown in PDF/A sample project (http://www.pdftron.com/pdfnet/samplecode.html#PDFA) that is also included as part of the SDK.
For additional documentation, please see: http://www.pdftron.com/pdfnet/documentation.html