RadControls for ASP.NET AJAX

Telerik RadControls utilize embedded webresources. The JavaScript files used by the control should be streamed by the web resource handler. In some cases requesting the webresource handler (webresource.axd) returns error number 404. This indicates that the files are not streamed and you may experience JavaScript errors on the client. 

Here some tips how to solve the problem:

First approach

1. Open IIS management snap-in (e.g. run inetmgr.exe)
2. Right click your web site and choose properties
3. Go to the "Home Directory" tab and click the "Configuration" button
4. A dialog should pop out and you will see the mappings listbox
5. Find the entry for the ".axd" extension and edit it by clicking the "Edit" button
6. In the new dialog uncheck the "Verify if file exist" checkbox.

Second approach 

Alternatively, if the steps above do not solve the issue, you can try creating an empty WebResource.axd file in the web site root folder.

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