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Url.Action() does not remove default values

I have rather a simple routing map.
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}/{seoName}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional, seoName = UrlParameter.Optional }
);
Now, If use Url.Action("Index", "Home"), it does not properly remove defaults values of the route. And it gives me /Home/Index.
Now, if I remove either {id} or {seoName}, and its corresponding default value, then the URL is properly generated like / (root).
What I am missing here? It does not seem to be an ambient value, since I am visiting the main page with no ids, nor seoNames.
Any ideas?

You would need multiple mappings to achieve what you want as you are only allowed to make the last route placeholder optional.
routes.MapRoute(
name: "SeoFriendly",
url: "{controller}/{action}/{id}/{seoName}",
defaults: new { controller = "Home", action = "Index", seoName = UrlParameter.Optional }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

C# MVC Route detection

I need to call customer profile page like "(www.mysite.com/John) or (www.mysite.com/customer name)"
so i had add route to be like that
routes.MapRoute(
name: "Profile",
url: "{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
but it always go to the first route as if i need to open any controller it does n`t work
any advice?
Thanks.

the route wont work like that so you have two options
1) When going to any action your URL should be www.mysite.com/controller/action or else it will give HTTP 404 error
2) You can make route unique by adding prefix www.mysite.com/Customer/John like this
routes.MapRoute(
name: "Profile",
url: "Customer/{id}",
defaults: new { controller = "Home", action = "Index"}
);
and your action should be
public ActionResult Index(string id)
{
string SurveyName = "";
if (id != null)
SurveyName = id;
if (!string.IsNullOrEmpty(SurveyName))
{
ViewBag.Survey = SurveyName;
}
return View();
}

You need to change your controller and action according to your requirement, you are still providing default values to controller and action.
You can also use Html.ActionLinkat to refer to your desired view
ex. Html.ActionLink("action_name","Controller_name")

Your route has a single optional parameter and is working like a catch all route.
[EDIT]
You can't use the constraint as I said on my previous answer if you don't have an pattern to restrict the route. Based on this you can remove the id = UrlParameter.Optional from defaults (by this change your route will be reached only when the url contains the id parameter).
routes.MapRoute(
name: "Profile",
url: "{id}",
defaults: new { controller = "Employee", action = "Index"}
);
Another option is to create a custom route constraint to check if your profile id is valid but take care since it can slow down your application since it'll be executed on every request (maybe caching your profile list could help on this).
[OLD ANSWER]
An easy way to restrict a route scope is using constraint.
The route below is reached just if the id parameter is a value with 4 digits (you can use your own regex to fit your requirements).
routes.MapRoute(
name: "Profile",
url: "{id}",
defaults: new { controller = "Employee", action = "Index"},
constraints: new { id = #"\d{4}" }
);

Make these changes. It worked for me.
routes.MapRoute(
name: "Profile",
url: "{id}",
defaults: new { controller = "NewCon", action = "Demo", id = UrlParameter.Optional }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

ASP.NET MVC5 route to a div on a view

I'm trying to setup a route that's routes to a div on a page in my RouteConfig.cs file but doesn't work (HTTP Error 403.14 - Forbidden).
routes.MapRoute(
name: "Default",
url: "{controller}/{action}#{locId}/{id}",
defaults: new { controller = "Home", action = "Index", locId =
"theDiv", id = UrlParameter.Optional }
);
Can somebody help me out please?
Thanks in advance.

This should do it,
routes.MapRoute(
name: "WithId",
url: "{controller}/{action}/{id}#{HTMLElementId}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional, HTMLElementId = UrlParameter.Optional }
);
this sets it as an optional parameter.
thanks

Try to build your route differently using this format :
url:"{controller}/{action}/{id}#{locid}",

ASP.NET MVC Routing & Html.ActionLink

In my routes file I have this setup:
routes.MapRoute(
name: "Stages", // Route name
url: "Stages/{action}", // URL with parameters
defaults: new { controller = "Tasks", action = "Index", taskTypeIds = new[] { TaskTypes.Stage } }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
The problem now is that I want to define two main menu items:
<li>#Html.RouteLink("Stages", "Stages")</li>
<li>#Html.ActionLink("Tasks", "Index", "Tasks")</li>
But what this outputs for both is the same URL:
/Stages
Why is it doing this, and can I get around it?

Your controller is Task for stages route.

No route in the route table matches the supplied values after RedirectToAction

I have a next routes settings:
routes.MapRoute(
name: "TestCC",
url: "TestCC/{action}",
defaults: new { controller = "PaymentHub", action = "Cancelled" }
);
routes.MapRoute(
name: "Default",
url: "{culture}/{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
When user is open TestCC action I try to redirect them to other action that should conteine {culture}
public ActionResult TestAction()
{
TempData["pp"] = Request["p1"];
TempData["dd"] = Request["p2"] ;
return RedirectToAction("OtherAction", "OtherController");
}
How to add {culture} part to redirect in RedirectToAction?
I don't want to write culture="value" to Default route.

Not sure if I understand you correctly, but I guess this will do what you want:
RedirectToAction("OtherAction", "OtherController", new {culture = "value"});