Untitled

How to sort in a related table in ASP.NET MVC3
var userQuery = from u in _db.Users
                where u.Username.ToLower().Contains(search.ToLower())
                    || u.FirstName.ToLower().Contains(search.ToLower())
                    || u.LastName.ToLower().Contains(search.ToLower())
                select u.FirmID;

var query = from f in _db.Firms
            where f.Name.ToLower().Contains(search.ToLower())
                || f.Keyword.ToLower().Contains(search.ToLower())
                    || f.KeywordList.ToLower().Contains(search.ToLower())
                    || userQuery.Contains(f.ID)
            select f;

// order by firm name
query = query.OrderBy(f => f.Name);

public class User
{
    [Key]
    public int ID { get; set; }

    public string Username { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public int FirmID { get; set; }
    [ForeignKey("FirmID")]
    public virtual Firm Firm { get; set; }
}

public class Firm
{
    [Key]
    public int ID { get; set; }

    public string Keyword { get; set; }
    public string KeywordList { get; set; }
    public string Name { get; set; }

    public virtual ICollection<User> Users { get; set; }
}

query.OrderBy(f => f.Name).Select(aux => new
{
   Firm = aux.Firm,
   Users = aux.Users.OrderBy( x => x.Username )
})

query.OrderBy(f => f.Name)
     .ToList()
     .ForEach(f => f.Users = f.Users.OrderBy(u => u.LastName).ToList() );

@foreach (var user in Model.Users.OrderBy(u => u.LastName)) {  }