Hi,

overriding SavePageStateToPersistenceMedium (and then equally
LoadPageStateFromPersistenceMedium) is the solution in ASP.NET 1.x. With
ASP.NET 2.0, you could just provide your own PageStatePersister class to
override the behaviour (or use the built.in SessionPageStatePersister class)

This article also gives some insight:
http://aspalliance.com/472

You will *still* have a minimal ViewState property,
representing the page itself, even if you turn off the view state
on each and every control and even if you disable it completely.

See :
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspnet/html/a
sp11222001.asp
and
http://www.aspnetresources.com/articles/ViewState.aspx

Juan T. Llibre, asp.net MVP
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The _VIEWSTATE hidden field will always be there for an ASP.NET page, but if
you've diabled viewstate then its contents will be tiny and mostly empty,
only filled with minimal data that ASP.NET requires to function properly.