在Asp.Net中生成RSS MVC 3返回纯XML

I'm following a tutorial where the author inherits from ActionResult to create RssViewResult class that will return RSS. When I run the code and go to the action method that returns RssViewResult as a result the plain XML file appeares. I'm new to RSS and seems like in this tutorial there is no special view that has been created.I'm following a tutorial where the author inher