'~/Telerik.Web.UI.WebResource.axd' is missing in web.config

You might get this telerik exception while developing against software involving telerik rad controls in SharePoint 2010.

Full exception reads like:

Exception information: 

    Exception type: InvalidOperationException 

    Exception message: '~/Telerik.Web.UI.WebResource.axd' is missing in web.config. RadScriptManager requires a HttpHandler registration in web.config. Please, use the control Smart Tag to add the handler automatically, or see the help for more information: Controls > RadScriptManager 

Well, you need to do some entries for supporting telerik controls in SharePoint 2010 but I missed following entry, modifying web.config upon it resolved my issue:

 

  

Please note there are few more entries you need to do inorder to support telerik controls in a custom aspx page under SharePoint 2010 ( you can safely ignore the MS Ajax related entries as 2010 already contains AJAX inbuilt)