URL.Action() including route values

Question

I have an ASP.Net MVC 4 app and am using the Url.Action helper like this: @Url.Action("Information", "Admin")

This page is used for both adding a new and edit an admin profile. The URLs are as follows:

 Adding a new:       http://localhost:4935/Admin/Information
 Editing Existing:   http://localhost:4935/Admin/Information/5 <==Admin ID

When I'm in the Editing Existing section of the site and decide that I would like to add a new admin I click on the following link:

 <a href="@Url.Action("Information", "Admin")">Add an Admin</a>

The problem however that the above link is actually going to http://localhost:4935/Admin/Information/5. This only happens when I'm in that page editing an existing admin. Anywhere else on the site it links correctly to http://localhost:4935/Admin/Information

Has anyone else seen this?

UPDATE:

RouteConfig:

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );    

Answer 1

outgoing url in mvc generated based on the current routing schema.

because your Information action method require id parameter, and your route collection has id of your current requested url(/Admin/Information/5), id parameter automatically gotten from existing route collection values.

to solve this problem you should use UrlParameter.Optional:

 <a href="@Url.Action("Information", "Admin", new { id = UrlParameter.Optional })">Add an Admin</a>

Answer 2

You also can use in this form:

<a href="@Url.Action("Information", "Admin", null)"> Admin</a>