In ASP.NET MVC, deserialize JSON prior to or in controller's action method

I am working on a website that will post a JSON object (using jQuery Post method) to the server side.

{ 
    "ID" : 1,
    "FullName" : {
       "FirstName" : "John",
       "LastName" : "Smith"
    }
}

At the same time, I wrote classes on the server side for this data structure.

public class User
{
    public int ID { get; set; }
    public Name FullName { get; set;}
}

public class Name
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

When I run the website with following code in my controller class, the FullName property doesn't get deserialized. What am I doing wrong?

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Submit(User user)
{
    // At this point, user.FullName is NULL. 

    return View();
}