ASP.NET's WebForms model acquired semantic, or "friendly", routing feature several years ago. This routing feature lets you use semantic URLs instead of page-based URLs. For example, consider a page named CustDtls.aspx. Using the default page-based routing, that page is accessed with this URL:

In this case, the URL given is mapped directly against the file CustDtls.aspx in the application root.

The ASP.NET semantic routing feature lets you get to that page with this URL: 

The image below shows ASP.NET semantic routing in action. 

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