using System;

using System.Diagnostics;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    private static void Benchmark(Action act, int iterations)

    {

        GC.Collect();

        act.Invoke(); // run once outside of loop to avoid initialization costs

        Stopwatch sw = Stopwatch.StartNew();

        for (int i = 0; i < iterations; i++)

        {

            act.Invoke();

        }

        sw.Stop();

        Console.WriteLine((sw.ElapsedMilliseconds).ToString());

    }

​

    public static void Main(string[] args)

    {

        var list = new int[10];

        var list2 = new int[1000000];

        var loops = 10000000;

        Benchmark(() => { var x = list.Count(); }, loops);

        Benchmark(() => { var x = list2.Count(); }, loops);

        Benchmark(() => { var x = list.Length; }, loops);

        Benchmark(() => { var x = list2.Length; }, loops);

    }

}