How do I generate a RouteLink to a route in a different area?

Question

I have two different areas, and I have a route in one of those areas that is specific to that area, but I need to generate a link to that route using Html.RouteLink from another area (it's how you get over into the new area) but it won't work... It doesn't seem possible to use RouteLink to routes in a different area.

What is the best way around this? Should I just define a new route in the other area and name it differently?

UPDATE (code):

In master page in the main area (I've tried it multiple ways, all of which have produced same result):

<a href="<%= Url.Action("Index", "Home", new { area = "CustomerSite", route = "CustomerSite_preview", domain = (string)ViewData["DomainName"] }, null) %>">

In the CustomerSite area registration as the first route registered:

        context.MapRouteLowercase(
            "CustomerSite_preview",
            "preview/{domain}/{controller}/{action}/{id}",
            new { area = "CustomerSite", controller = "Home", action = "Index", id = "" },
            new { isCustomerSite = new CustomerSiteRouteConstraint() },
            new string[] { "GrayHills.CarLotHosting.Web.Areas.CustomerSite.Controllers" }
        );

Answer 1

In your route object you just need a property named area with the name of the area.

Html.RouteLink("My Link Text", 
                new { area = "MyArea", controller = "MyController" ... }, 
               null);

Answer 2

You need to change your route definition - see the answer http://stackoverflow.com/questions/1298422/asp-net-mvc-url-action-routing-error for more info.

In essence, your route should look as follows since you explicitly supply the controller name and action:

context.MapRouteLowercase(
        "CustomerSite_preview",
        "preview/{domain}/home/index/",
        new {   area = "CustomerSite"
              , controller = "Home"
              , action = "Index"},
        new { isCustomerSite = new CustomerSiteRouteConstraint() },
        new string[] { 
            "GrayHills.CarLotHosting.Web.Areas.CustomerSite.Controllers"}

The Url.Action will look like

<a href="<%= Url.Action("Index"
                        , new {domain = (string)ViewData["DomainName"] }
                        , null) %>">

which will result in a Url like http://localhost:56291/preview/somedomainname/home/index