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ASP.Net C# MVC create exception to a global route

I am writing a URL Shortener application.
When someone enters root.com/whatever, they are redirected to a configured URL.
I managed to create a global route which will catch the paths after the root ("whatever" above) and execute the corresponding redirection successfully.
My problem and question is this:
The admin interface is at root.com/admin and when I try to access that, I get the global controller. How do I make an exception to the global controller for "admin"?
Here is what I have in my route config right now:
routes.MapRoute(
name: "Admin",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Admin", action = "Index", id = UrlParameter.Optional }
);
routes.MapRoute(
name: "Global",
url: "{suffix}",
defaults: new { controller = "Home", action = "Index", suffix = UrlParameter.Optional }
);
For the first route, I also tried:
routes.MapRoute(
name: "Admin",
url: "admin/{action}/{id}",
defaults: new { controller = "Admin", action = "Index", id = UrlParameter.Optional }
);
And I also tried putting it second in the file.

I don't know if this will help you, but take a look at this stack overflow posting: ASP.Net MVC: Routing issue which throwing exception
This person reduced the more specific route and it worked for him.

Disabling Default Routes on Asp.net Mvc

I am using Asp.net Mvc 5 with C#.
I want to disable default routing in my project. My map routes like;
routes.MapRoute(name: "News",
url: "haberler",
defaults: new { controller = "News", action = "Index"});
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
When a user visits my website's news page, it's like;
www.domain.com/haberler
But also the user can visit the news page as below;
www.domain.com/news
I want to remove that "/news" or direct to seo-friendly url like; "/haberler"
So how can I disable default routing (Controller-Name-Convension) routing?

Instead of removing the "default" route, you can add a controller constraint to it
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
constraints: new { controller = #"(Account|Manage|Home)" }
);
Like this, /news will return 404 Not Found.

In MVC, the convention is to map URLs to a particular Action on a particular Controller. Remove default route to disable default convention:
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

www.domain.com/news will not match in any of your routes hence it will throw an error.

Try removing with this
RouteTable.Routes.Remove(RouteTable.Routes["NAME ROUTE YOU WISH TO RMOVE"]);
Hope this will helps you.

Why do you need to specify the controller and action in the default route for the RoutesTable in ASP.NET MVC?

Why do we have to specify the defaults for the default route?
This is a normal default route:
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
Why can't I just do this:
routes.MapRoute(
name: "Default",
url: "Home/Index/{id}",
defaults: new {id = UrlParameter.Optional }
);
I already specified the action and controller but when I use this way, I get an error. Does anyone know why you have to specify the action and controller in the default route?

Without a default set of parameters, how is routing supposed to know where to send this URL?
/
The defaults let you do that URL, so it knows to use the 'Home' controller's 'Index' method.
Or:
/Articles
In this case, the 'Index' action of the 'Articles' controller would be called. Without those defaults, again, routing has no way to know what to do.

ASP MVC Simple Routing Optional Parameter

I have a couple of routes in my config that seem to work OK in the IIS express dev environment, but not in IIS. I can get to the route BlogArchive route, but not the BlogDetailroute.
routes.MapRoute(
name: "BlogDetail",
url: "Blog/{Slug}",
defaults: new { controller = "Blog", action = "Detail", slug = UrlParameter.Optional }
);
routes.MapRoute(
name: "BlogArchive",
url: "Blog",
defaults: new { controller = "Blog", action = "Index" }
);
This can be fixed by just adding an additional pointer to the BlogDetail i.e. making the whole url map to Blog/Entry/{Slug}, but I would rather not have to have that extra bit. I can't seem to find any examples on the web, so excuse me if I am missing something simple.

Add routing in case of missing "action" in url ({controller}/{id})

How can I set up a {controller}/{id} routing in ASP.NET MVC 5.
What I would like to achieve: if there are no {action} defined, call Index() with id.
I tried thism but didn't work:
// Keep default routing
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
// Add own routing in case of missing "action"
routes.MapRoute(
name: "Controller/Id",
url: "{controller}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);

After reading ameer's comment it become clear that the routing is not that "intelligent" that I was hoping for, so if the URL pattern is matching one route, but no such controller/method found, it will not "fall through" to the next routing command, but will raise exception.
So I had tried what Simon suggested, added constraint to my custom routing, and reversed the order, and it works now. However, if I would like to have other mappings similar to attachments, I'd have to add them one by one.
Working code:
routes.MapRoute(
name: "Attachments",
url: "attachments/{id}",
defaults: new { controller = "Attachments", action = "Index", id = UrlParameter.Optional }
);
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);