Allow only valid Data in URL Routing ASP.Net

hi

i use url routing according to this article

http://msdn.microsoft.com/en-us/library/cc668202%28v=vs.90%29.aspx

in global.asax i use this code

public static void RegisterRoutes(RouteCollection routes)

    {

        routes.Add("BikeSaleRoute", new Route

        (

           "{Data}/",

           new CustomRouteHandler("~/Details.aspx")

        ));

    }

here when i write behtob.com/1111   or behtob.com/test   it go to details.aspx page i want instead of {Data} it  read behtop column from my DB  and according to that behcode it go to details.aspx and fill that page with user's  information that have behcode in address bar i want bind it from data base

I want some thin like facebook.

thanks