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Lets say you have an action method to display products in a shopping cart // ProductsController.cs public ActionMethod Index(string gender) { // get all products for the gender } Elsewhere, in a masthead that is displayed on every page you are using Url.RouteUrl to create HREF links to other pages on the site : <a href="<%= Url.RouteUrl("testimonials-route", new { }) %>" All Testimonials </a> This testimonials-route is defined in global.ascx by the first route below. Notice that the above call to RouteUrl does not provide a gender , but the route is defined with a default of 'neutral' so we'd expect Testimonials.Index("neutral") to be called. routes.MapRoute( "testimonials-route", "testimonials/{gender}", new { controller = "Testimonials", action = "Index", gender = "neutral" }, new { gender = "(men|women|neutral)" } ); routes.MapRoute( "products-route", "products/{gender}", new { controller = "Products", action = "Index", gender = (string)null }, new { gender = "(men|women|neutral)" } ); If someone visits the page /products/women we get an HREF to /testimonials/women If someone visits the page /products then we get an empty HREF (the call to RouteUrl returns null). But that doesn't make sense does it? testimonials-route is supposed to default to 'neutral' for us if we don't provide a route value for it? What turns out is happening is that Url.RouteUrl(routeName, routeValues) helper extension will first look in its routeValues parameter for a gender route value and if it doesn't find it in that dictionary it will look at the current URL that we're on (remember that Url is a UrlHelper object which has the context of the current request

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