what is this error in "INvalid post back or call back argument"
<p>What is this error, i am unable to sort it out.
I am using .net framwork 4.0, and ajax control tool kit 3.5, so is it any thing to do with ajax control tool kit?</p>

<pre><code>Invalid postback or callback argument.  Event validation is enabled using &lt;pages enableEventValidation="true"/&gt; in configuration or &lt;%@ Page EnableEventValidation="true" %&gt; 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.
</code></pre>
