Invalid ViewState after a-sync postback?

It could happen for few reasons. Foremost is that your Ajax controls on refresh is creating its own viewstate which replaces main page viewstate. There are some solutions I read on other forums like adding Response.

End after the Ajax output. You may need to handle ThreadAbortException when you use Response. End Second suggested way by another user is taking off Runat from Ajax form element.It can also happen when the Ajax postback url is going to a separate page to grab the data.

If that is the case you might want to change the url to the same page.

Oddly, it's actually a button which sends an email then toggle's an asp:Label's visible property. – Echilon Sep 20 at 15:45.

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