ASP.NET - Error occur when Page is postback onclick event

hi everyone ,
                     I have problem when we call java script function on  onclick event of button like this.
                    <input id="btnsearch1" value="Search" type="submit" onclick='return btnSearch();'/>

                    <input id="btnsearch1" value="Search" type="submit" onclick="btnSearch();"/>

 we got following error,

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

 plz provide me solution for this ASAP.


Thanks 

Alok ranjan

Hello Alok,

For complete solution and the reason of that issue is given on the below link:

http://blogs.msdn.com/b/amitsh/archive/2007/07/31/why-i-get-invalid-postback-or-callback-argument-errors.aspx

Alok,

Also you can follow the below things:

Just make sure your Web.Config file is up with Ajax scripts. Also, make sure - Scriptmanagers partial rendering is enabled

Disable eventvalidation (bad idea, because you lose a little of security that come with very little cost).

Use ASP.NET Ajax UpdatePanel. (Put the listbox in the Updatepanel and trigger a update, if you add or remove listbox. This way viewstate and related fields get updates and eventvalidation will pass.)

Forget client-side and use the classic postback and add or remove the listitems server-side.

For this set

EnableEventValidation="true"

in page ditrective.

hi..

in you aspx file you should put the first line as this :

<%@ Page EnableEventValidation="false" %>