Dave Hayden

won't the route of "admin/[controller]/[action]/[id]" by default go to the ProductsController as opposed to a ProductsAdminController

There's a ProductsAdmin controller defined like public class ProductsAdminController : AdminController { ... } so the URL is a little different:

admin/ProductsAdmin/delete/123

The regular ProductsController, in this case, does not have a Delete() action. 

I guess that, if you want that to be automatic, you could use a custom RouteHandler for that route and alter the controller name on the fly:

public class AdminRouteHandler : IRouteHandler
{
  public IHttpHandler GetHttpHandler(RequestContext context)
  {
    MvcHandler h = new MvcHandler();
    string controller = context.RouteData.Values["controller"] as string;
    context.RouteData.Values["controller"] = controller + "Admin";
    h.RequestContext = context;
    return h;
  }
}

//And change the route to:


RouteTable.Routes.Add(new Route
{
  Url = "admin/[controller]/[action]/[id]",
  Defaults = new { action = "Index", id = (string)null },
  RouteHandler = typeof(AdminRouteHandler)/* <== CHANGED!!!*/
});

I haven't really tested the above code but it should be an interesting thing to try.