Invalid postback or callback argument

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I have a setting in my web.config

<sessionstate mode="InProc" cookieless="AutoDetect" timeout="90">.In normal scenarios this is working fine.

I have a web page where when I am clicking a button the form data will be inserted to db.

If I remove cookieless="AutoDetect" from the node mentioned earlier while clicking the button it is throwing the error "Invalid postback or callback argument".

This is making me weird. Please give me some clue.

Posted 27-Aug-12 2:19am

Rakhesh Rajan

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Sandeep Mewara · Answer 1 · 2012-08-27T02:28:00

Solution 1

Easy/direct solution can be adding enableEventValidation="false" in your Page directive or Web.config file.

Detailed explanation here: Invalid postback or callback argument solution. Event validation...[^]

Posted 27-Aug-12 2:28am

Sandeep Mewara