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Concatenating in memory

I have PDF files that are saved in a DB as binary data.
How would I concatenate these files without first creating a physical file?

Dear Andrew,

Thanks for considering Aspose.

The Concatenate function support input/output Pdf Stream.
1.Write the binary data into a Stream as an input source.
2.Call the Concatenate function.
3.Save the output stream to DB or a file.

Best regards.