"Warning: Page has Expired" caused by autopostback

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

I have a page webform1.aspx with dropdownlist and sutopostback=true.
Now if I go towebform2.aspx from webform1.aspx, then I use IE back
button, I will get "Warning: Page has Expired" message. Anybody know
how to fix this problem?

thanks,
Amy

.

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