C# - WebForms - Using GetRouteUrl In Markup

I have been trying to figure out how to use the Routing features with ASP.net 4.0 WebForms. I added a route to my route collection:

void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
}
void RegisterRoutes(RouteCollection routes)
{
routes.MapPageRoute(
"about-route",
"about/",
"~/About.aspx"
);
}

In my master page I tried to do the following: <asp:HyperLink ID="asdf" runat="server" NavigateUrl='<%= GetRouteUrl("about-route", new {}) %>'>Test</asdf> I got a compiler error: Server tags cannot contain <% ... %> constructs. What is the proper way to create a route URL in a server control in Web Forms? I also need to include it in the following:

<asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal">
<Items>
<asp:MenuItem NavigateUrl="ROUTE HERE" Text="Home"/>
<asp:MenuItem NavigateUrl="ROUTE HERE" Text="About"/>
</Items>
</asp:Menu>