context.MapRoute(
    "Admin_default3",
    "Admin/{controller}/{action}/{id}/{id2}/{id3}",
    new { action = "Index" }
);
context.MapRoute(
    "Admin_default2",
    "Admin/{controller}/{action}/{id}/{id2}",
    new { action = "Index"}
);

context.MapRoute(
    "Admin_default",
    "Admin/{controller}/{action}/{id}",
    new { action = "Index", id = UrlParameter.Optional }
);
	
public ActionResult Search(Guid? id, int? id2, bool? id3)
{
    Guid? source = id;
    int daysOld = id2;
    bool includeNonEnglish = id3;

    //.... Action!
}
	
Html.ActionLink(title, "Action", "Controller", new { source = <value>, daysOld = <value>, includeNonEnglish = <value> });
	
Html.ActionLink(title, "Action", "Controller", new { id = <value>, id2 = <value>, id3 = <value> });