You don't say how you open the new window, but maybe this applies to you:
[url]http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b316920?[/url]

--
Carsten Thomsen
Enterprise Development with Visual Studio .NET, UML, and MSF
[url]http://www.apress.com/book/bookDisplay.html?bID=105[/url]
"Lars Kristian Clausen" <lars_clausen@hotmail.com> wrote in message
news:8b181eed.0303100131.462dfe72@posting.google.c om...
> Hi All
>
> I have a problem with a asp.net webShop.
>
> I have a page were the user types in all userdata. If the user wants
> to pay per bank, the next page opening is a 'ThankYou' page (no
> problems wit that). And if the user wants to pay per credit card, a
> new window has to open with a secure line.
>
> When I try to open the new window the validation on the main page
> dos't work right - and the new page opens and shows: The View State is
> invalid for this page and might be corrupted.
>
> Have anyone met this problem or have an idea how to solve it.
>
> Thanks in advance.
>
>
> J