Knowledgebase: Server Side
"AjaxControlToolkit is undefined" Error message
Posted by Diego Cousinet on 09 September 2011 11:21 AM

Some Internet Explorer browser versions report errors when using AJAX controls, as below:

Message: 'AjaxControlToolkit' is undefined
Line: 1431
Char: 5
Code: 0
URI: *******

This means you need to Set the "CombineScripts" property of the ToolkitScriptManager to false, in your web.config file.

<ajaxToolkit:ToolkitScriptManager runat="server"   ID="ajaxScriptManager" EnablePartialRendering="true"   CombineScripts="false" /> 

If you notice more than one error you would be better off on a dedicated application pool. Let us know if this is the case and we can do this for you.

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