pdf get orientation - vb.net

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Hey

I have a big problem:
I need to get the orientation of a PDF-File because I am working for an addon of an existing program, wich edits one XML file to apply annotations on the document.

... I need to know if the PDF is the portrait format or in the landscape format

(I have to use different corrdinates for the annotation)


So do you know how to fix my problem?
So If you have any idea, please help me. You can use every language you want.. (c#, java, c++, etc...)

But I don't want to use any commerical library..


Thanks!


Best Regards
Z