using System;

using System.Collections.Generic;

using System.Linq;

​

public class Foo

{

    public int cowbell { get; set; }

}

​

public class Program

{

    private static List<Foo> _Foos;

    public static List<Foo> Foos { get { return _Foos ?? (_Foos = new List<Foo>()); } }

    public static void Main()

    {

        Foos.Add(new Foo { cowbell = 1 });

        Foos.Add(new Foo { cowbell = 1 });

        Foos.Add(new Foo { cowbell = 2 });

        Foos.Add(new Foo { cowbell = 2 });

        Foos.Add(new Foo { cowbell = 3 });

        Foos.Add(new Foo { cowbell = 3 });

        Foos.Add(new Foo { cowbell = 4 });

        Foos.Add(new Foo { cowbell = 4 });

        Foos.Add(new Foo { cowbell = 5 });

        Foos.Add(new Foo { cowbell = 5 });

        Foos.Add(new Foo { cowbell = 6 });

        Foos.Add(new Foo { cowbell = 6 });

        var highFoos = Foos.GroupBy(foo => foo.cowbell).OrderByDescending(x => x.Key).FirstOrDefault();

        foreach (var foo in highFoos)

        {

            Console.WriteLine(string.Format("cowbell: {0}", foo.cowbell));

        }

    }

}