Hello Raja Muthaiah,
The Razor view engine has been designed in such a way, so that it does not support any WebControls, including our RadControls for ASP.NET AJAX. You should use the old WebForms view engine if you want to integrate RadControls for ASP.NET AJAX in an MVC project.
For more information, please refer to the RadControls documentation:
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed