URL routing was a capability we first introduced with
ASP.NET 3.5 SP1, and which is already used within ASP.NET MVC applications to
expose clean, SEO-friendly “web 2.0” URLs. URL routing lets you configure
an application to accept request URLs that do not map to physical files.
Instead, you can use routing to define URLs that are semantically meaningful to
users and that can help with search-engine optimization (SEO).
For example, the URL for a traditional page that displays
product categories might look like below:
Using the URL routing engine in ASP.NET 4 you can now
configure the application to accept the following URL instead to render the
With ASP.NET 4.0, URLs like above can now be mapped to both
ASP.NET MVC Controller classes, as well as ASP.NET Web Forms based pages.