<s>[INST] Here's an example ASP.NET MVC application that has two controllers: `Home` and `Admin`.

```csharp
namespace Website
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            return View();
        }
    }

    public class AdminController : Controller
    {
        [Authorize]
        public ActionResult Dashboard()
        {
            return View();
        }
    }
}
```

Let's create a custom authorization attribute and use it to restrict access to the `About` action on the `Home` controller.

Here's the custom authorization attribute:

```csharp
namespace Website.Attributes
{
    public class CustomAuthorizeAttribute : AuthorizeAttribute
    {
        public string Level { get; set; }

        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
            // Create authentication logic here
            return true;
        }
    }
}
```

This attribute can be used on a controller to specify a specific `Level` of authorization. Here's how we can apply it to the `About` action on the `Home` controller:

```csharp
namespace Website
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        [CustomAuthorize(Level = "Moderator")]
        public ActionResult About()
        {
            return View();
        }
    }
}
```

However, as you can see, the logic to authenticate is still missing in the `CustomAuthorizeAttribute`. Let's add some authentication logic.

Let's assume we are authenticating a custom type called `User`.

```csharp
namespace Website.Models
{
    public class User
    {
        public string Username { get; set; }
        public string Level { get; set; }
    }
}
```

Here's a possible implementation of `AuthorizeCore` in `CustomAuthorizeAttribute`:

```csharp
protected override bool AuthorizeCore(HttpContextBase httpContext)
{
    if (!httpContext.User.Identity.IsAuthenticated)
        return false;

    var user = httpContext.Session["User"] as User;

    if (user == null)
        return false;

    if (string.IsNullOrEmpty(Level))
        return false;

    if (string.Compare(user.Level, Level) == 0)
        return true;

    return false;
}
```

With this code, it checks the user's level against the required level of the action. However, I need it to check the level requirement in relation to the action.

In other words, if a user has a level that is "greater" than the required level for an action, it should be authorized as well. However, the implementation I provided does not do this.

For instance, let's say "Admin" has a higher "level" than "Moderator". If a user is an `Admin`, I want them to be authorized for an action that requires a `Moderator`. How do I do this?[/INST]