gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Intranet
{
    public static class MenuExtensions
    {
        public static IMenu NextParent(this IMenu menu)
        {
            return (from xy in menu where xy.Level == Level orderby xy.Order select xy).AsEnumerable().SkipWhile(n => n.Order <= Order).Take(1).FirstOrDefault();            
        }
    }
}