Why would you ever use asp.net's ViewState storage object over the Session storage object?

Question

Other than because session storage is session-global to more than one page, why would you ever want to use the viewstate to hold values?

It seems kind of ridiculous

Answer 1

Sessions run out, Viewstate does not - you can go back an hour later and your viewstate will still be available. Viewstate is also consistently available when you go back/forward on the website, Session changes.