How to display model popup at first time page load only

Posted by Guna Sundari on Stack Overflow See other posts from Stack Overflow or by Guna Sundari
Published on 2012-09-17T09:35:50Z Indexed on 2012/09/17 9:37 UTC
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I used the following code to display model popup for the first time page load,

<script type="text/javascript">
 function pageload() {
     var chkPostBack = '<%= Page.IsPostBack ? "true" : "false" %>';

     if (chkPostBack == 'false') {

         var popup = $find('ModalPopupExtender1');
         if (popup != null) {
             popup.show();
         }

     }

 }    

I got the following error, Please help me.

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

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