How do I compare 2 PDF files for equality?

Hi,
I want to be able to compare 2 pdf files programmatically in C#.
I have tried using binary compare and I have found that
2 identical files do not match due to meta data I assume.
All I want to do is compare 2 files and match if
the displayed part is the same. The files have text, lines
and jpg.
If I cant do it in C# is there any library that can?
Malcolm

The Acrobat SDK includes a PDF compare function but its only available to plugins (written in C/C++).

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