Ajax control error ExtenderControlBase.cs

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Hello,

I am running aspx page in a iframe which is in another aspx page. This iframe will be displayed as a lightbox(popup) on click of a button. While loading of iframe i am getting ajax assembly error

C:\Users\Stephen\Documents\Releases\AjaxControlToolkit50401\AjaxControlToolkitPrime\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs

If i click continue its displaying below message in iframe as a exception

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

Can anyone help me..

Thanks

Posted 12-Jun-13 1:20am

Mada Naga Sankar

Updated 12-Jun-13 1:31am

AmitGajjar

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AmitGajjar 12-Jun-13 7:32am

Have you tried to search your error message in google ?

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_Amy · Accepted Answer · 2013-06-12T01:46:00

This usually means you have <%...%> blocks in the header of a page or your master page. There are two ways to solve this exception:
First:
Remove JavaScript from the header section of page and add it to body of the page and run your application it will work for you.
Second:
Replace the code block with <%# instead of <%=.

You can also see : How to fix : The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).[^]

--Amit