How to pass Area in Url.Action?

You can use this Url.Action("actionName", "controllerName", new { Area = "areaName" });

Also don't forget to add the namespace of the controller to avoid a conflict between the admin area controller names and the site controller names.

Something like this

 public override void RegisterArea(AreaRegistrationContext context)
        {
            context.MapRoute(
                "Admin_default",
                "Admin/{controller}/{action}/{id}",
                new { action = "Index", id = UrlParameter.Optional },
                  new[] { "Site.Mvc.Areas.Admin.Controllers" }
            );
        }

@Url.Action("{action}", "{controller}", new { Area = "areaname" });
@Html.ActionLink("LinkName", "{action}", "{controller}", new { area = "{areaname}" }, new { @class = "btn btn-cool" })

write area name as html attribute with anonymus object. you can use actionlink html helper extension method to achieve same thing.

If you want to create link for root controllers, it's enough to use this code:

Url.Action("ShowImage", "Page", new { Area = "" })