Routing To An Anchor On Another Page?

I am using Web Forms Routing in ASP.NET 4 and I am trying to route to a specific location on a page. On that page I have an element like <div id="3"> and I'd like to jump to this anchor from another page. For this purpose I have defined a Route in global.asax:

RouteTable.Routes.MapPageRoute("MyRoute", "Path/SubPath/{PageAnchor}",
"~/MyPage.aspx", true, new RouteValueDictionary { { "PageAnchor", null } });

The HyperLink to link to that page and the anchor "3" is defined this way in markup:

<asp:HyperLink ID="HyperLink1" runat="server"
NavigateUrl="<%$ RouteUrl:RouteName=MyRoute,PageAnchor=#3 %>">
Link</asp:HyperLink>

The problem with the generated link is that the # character in the URL gets encoded by %23 this way: http://localhost:1234/Path/SubPath/%233 so that I reach the target page but not at the specified anchor.Is there a way to avoid this unwished URL-encoding? Or any other way to route to an anchor?