ASP.NET issue with jQuery 1.5

I am getting this error

The state information is invalid for this page and might be corrupted

when I use jQuery 1.5 but if I replace with jQuery 1.4 then it work fine.

I want to know what is the reason behind this?

UPDATE :

I g开发者_如何学JAVAot this situation also after throwing Exception if I click on back button of browser and then click button of submit it's working now.:-)

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So:

<%@ Page Language="C#" EnableViewState="false"  %>