how to detect a url is css url or js url in c#

i have lots of urls.i want to check a url is a css url or a js url.can i do this???like i have a url like

http://lscdn.azureedge.net/content/css/v8/listing-v8.1.css,

http://lscdn.azureedge.net/content/js/v8/listing-v8.js?a=4.2/

both url contains a css or js url.

`http://us.sulekha.com/new-jersey-area` 

it is normal url.how to filter a url is css url or js url or a normal url in c#..how to do this??can anyone help me please???