asp.net friendly urls with old url rewriting

Hi 
I am getting very much help from here every time and thanks for it.
I am using seo friendly url that stored in database.
so when click on any category it shows me database saved url with aspx extension . now i want to remove aspx extension so it is only show my database seo friendly urls.
i was doing little digging on google and i found nuget package that called "asp.net friendlyurls "  packages and follow instruction of scott blog post link (http://www.hanselman.com/blog/IntroducingASPNETFriendlyUrlsCleanerURLsEasierRoutingAndMobileViewsForASPNETWebForms.aspx) 
but aspx extension didn't remove from url rewrite . MY page url is "category.aspx?cid=123" and it rewrite with my database url .
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