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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.

default routing not working

In my MVC application, I have following route configuration,
routes.MapRoute(
name: "ProductRoute",
url: "{productName}/{controller}/{action}/{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 }
);
Now if i give some thing like this, localhost:56789/prd1/Home/Index
The first routing is working.
However if i directly access localhost:56789/Home/Index or any other controller action, like localhost:56789/Account/Login the routing is not working.
Is it because I have a {productName} defined?
For testing purpose how can I add few products like prd1, prd2 along with routing?

Routes are matched against the request in the order they are defined. When a route matching the request is found, no further routes are considered. Thus, you need to list your routes in order of decreasing specificity.
However, your first route matches more requests than your second route, i.e. it is less specific than the second route:
When ASP.NET MVC tries to match the request for Home/Index to your routes, it will match the first route because it will consider Home to be the productName, it will consider Index to be the controller name and the rest of the parameters are not required.
You need to reorder your routes or make the first route more specific. This could be done by putting constraints on the productName parameter.
UPDATE
Without knowing anything about your products and their names, it is impossible for me to suggest an appropriate constraint. Maybe you could use a numeric SKU and have a constraint like
routes.MapRoute(
name: "ProductRoute",
url: "{productName}/{controller}/{action}/{id}",
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new { productName = #"\d+" }
);
forcing productName to be numeric.
Alternatively, you could change the url to
"products/{productName}/{controller}/{action}/{id}"
For more on constraints see this link or use Google.

For route configuration
routes.MapRoute(
name: "ProductRoute",
url: "{productName}/{controller}/{action}/{id}",
defaults: new { productName = 'put your method name to get productName over here', controller = "Home", action = "Index", id = UrlParameter.Optional },
namespaces: new string[] { "your namespace of controller" });
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional });

Rewriting url in asp.net-mvc4 (razor) with extention

Default of asp.net-mvc4 is http://domainname.com/products/1 with routes
routes.MapRoute(
name: "Products",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Products", action = "Index", id = UrlParameter.Optional }
);
and I want to rewrite to http://domainname.com/products/1.html that has .html extention .
Any ideas for this?

Do you mean this:
routes.MapRoute(
name: "Products",
url: "{controller}/{action}/{id}.html",
defaults: new { controller = "Products", action = "Index", id = UrlParameter.Optional }
);

Why would you want to put .html extension to a query string or route parameter?
if you take a website with html files, the extension is with the page not with the parameters. Don't know if you have any specific requirement to put it always at the end of the url. but it doesn't make any sense.
routes.MapRoute(
name: "Products",
url: "{controller}/{action}.html/{id}",
defaults: new { controller = "Products", action = "Index", id = UrlParameter.Optional }
);
you might have problems with iis after doing the above, please take a look at this discussion as well.
ASP.NET MVC Routing - add .html extension to routes

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 }
);