The Following error was reported in my datalist control having an image button.
when i clicko the image button the following message is the result.The
code i have written is not executing.
Invalid postback or callback argument.  Event validation is 
enabled using  in
 configuration or <%@ Page EnableEventValidation="true" %> 
in a page.  For security purposes, this feature verifies that arguments to
 postback or callback events originate from the server control that originally rendered them. 
 If the data is valid and expected, 
use the ClientScriptManager.RegisterForEventValidation method in order to register the 
postback or callback data for validation.