What are the general causes of an Invalid ViewState

We get multiple error messageswith Invalid Viewstate - mainly form the same aps pages.

Generally what is the cause?

We are using IIS 6 and I understand that it will recycle the pool when necessary.  Is there any way to limit that by frequency?  Will the app just crash if the recycle doesn't happen?  Does IIS 7 fix this?



Thanks
TimSweet220Asked:
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