Concatenate Two PDF Files in VB.NET?

Hi Experts,

Not sure if this is possible, but here goes - I need to be able to join two PDF files together programatically. Operating system is XP, so I am looking to maybe create a command line app using VB.NET and pass in the two filenames as switches. This app I then need to call from a script.

Is this possible using VB.NET? I am open to suggestions, but I do need this to be done via program control, with no UI. I have googled this but I'm not getting very far.

Any ideas?
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I dont kow whether you are ready to user 3rd pary controls. If yes then here is one example of it with code.
iText is a library that allows you to generate PDF files on the fly and its free 
gczAuthor Commented:
Thanks for the post.

I have done some further digging around and found a utility called pdftk, which is basically what I was hoping to end up with myself. It is a command line utility which can append pdfs among other things, and is going to be lot quicker than coding something myself:

Pass in the filenames, and the output filename and it does it for you, example:

'pdftk.exe pdf1.pdf pdf2.pdf cat output output.pdf'

This appends pdf1.pdf and pdf2.pdf and outputs them as output.pdf.

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