"Invalid Postback or callback argument" on modifying the DropDownList on the client side

Question

I know why it's happening and i turned the validation off on the page level, but is there a way to turn it off on the control level?

"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."

Answer 1

look this post.

Invalid postback or callback argument. Event validation is enabled using '<pages enableEventValidation="true"/>'

in this, i've used Subclass ListBox method. it works...