I haven't read anything against using them both simultaneously. But I wonder why you will have to use both together. May be you are interested in handling both at the same time.;) Still it depends upon the requirement and the approach towards it.
I would(not only me, but everyone would) suggest you for using one at a time to avoid confusion while programming, depending upon the security of the data you are willing to pass through different pages for processing. If there is not any necessity to have the data hidden from the user, one can go for Querystring usage, and anything needs to be hidden from users view(not showing up on the URL part) form processing is the right choice. Again, it fits to the requirement and situation.
As I am the one who use to play with Querystring values and try and see if I can find flaws in the way the page can process the data, I would not suggest you to go for querystrings for anything that deals data with seriousness.
Still you can get more views on this as it differs from person to person on approach.
Happy programming.
Cheers!
-Vijay G
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