using System;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

using System.Diagnostics;

public class Program

{

      const int _max = 10000000;

    static void Main()

    {

        // Version 1: use collection initializer.

        var s1 = Stopwatch.StartNew();

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

        {

            List<string> list = new List<string>()

            {

                "bird",

                "frog",

                "dog"

            };

            if (list.Count != 3)

            {

                return;

            }

        }

        s1.Stop();

        // Version 2: use Add method.

        var s2 = Stopwatch.StartNew();

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

        {

            List<string> list = new List<string>();

            list.Add("bird");

            list.Add("frog");

            list.Add("dog");

            if (list.Count != 3)

            {

                return;

            }

        }

        s2.Stop();

        Console.WriteLine(((double)(s1.Elapsed.TotalMilliseconds * 1000000) /

            _max).ToString("0.00 ns"));

        Console.WriteLine(((double)(s2.Elapsed.TotalMilliseconds * 1000000) /

            _max).ToString("0.00 ns"));

    }

}

​