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Invalid post back or callback argument. Event validation is enabled using in configuration or in a page. For security purposes, this feature verifies that arguments to post back or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the Client Script Manager.Register For Event Validation method in order to register the post back or callback data for validation.
 

how to remove this problem
Posted 5-Dec-11 0:46am
Edited 5-Dec-11 1:09am
v2
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Solution 1

Try setting EnableEventValidation="false" in the page directive. This should remove the problem
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v2
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Eduard Lu at 5-Dec-11 20:35pm
   
5!
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Solution 2

check this link it will solve your problem >>>>>>
 
http://forums.asp.net/t/1112458.aspx/1?Invalid+postback+or+callback+argument[^]
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Solution 3

Also have a read of this article, which helps explains what the error is
 
http://blogs.msdn.com/b/amitsh/archive/2007/07/31/why-i-get-invalid-postback-or-callback-argument-errors.aspx[^]
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