The routing engine can decouple the URL in an incoming HTTP request from the physical Web Form that responds to the request, allowing you to build friendly URLs for your Web applications. In ASP.Net 4.0, adding some more class like MapPageRoute in Route class.
How use the routing check this link
http://www.mindstick.com/Articles/9992a0bc-90f5-4f04-823a-31f901b61643/
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