System.ArgumentException: The serialized data is invalid
Some of you may faced this nasty error. May be while setting up a new web server or after upgrading an ASP.NET project. Well, I didnt not find any 100% good fix for this issue yet. As far as I know, this error occurs only for who have low-speed internet connection and those who do ’something’ before the page load completed. Here are two ways which /may/ help you resolve this issue. Well this worked for me:
1) Do not let the end-user touch keyboard or mouse 
before the page load is complete. For this you can use some “loading…” technique.
2) Try adding this to your web.config:
viewStateEncryptionMode="Never"
maxPageStateFieldLength="200" />
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