using System;

using System.Diagnostics;

public class Program

{

    const int Iterations = 10000;

    const int Tests = 10000;

    static int stateNumber = 0;

    public static void Main()

    {

        Stopwatch sw = new Stopwatch();

        double average1 = 0.0;

        double average2 = 0.0;

        double average3 = 0.0;

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

        {

            stateNumber = 0;

            sw.Restart();

            Test1(1);

            var elapsed1 = sw.Elapsed;

            average1 += elapsed1.TotalMilliseconds;

​

            stateNumber = 0;

            sw.Restart();

            Test2(1);

            var elapsed2 = sw.Elapsed;

            average2 += elapsed2.TotalMilliseconds;

​

            stateNumber = 0;

            sw.Restart();

            Test3(1);

            var elapsed3 = sw.Elapsed;

            average3 += elapsed3.TotalMilliseconds;

        }

        Console.WriteLine("Test 1 average time {0} ms", average1 / Tests);

        Console.WriteLine("Test 2 average time {0} ms", average2 / Tests);

        Console.WriteLine("Test 3 average time {0} ms", average3 / Tests);

    }

    private static void Test1(int n)

    {

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

        {

            stateNumber += n;

        }

    }

​

    private static void Test2(int? n)

    {

        if(n.HasValue)

        {

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

            {

                stateNumber += n.Value;

            }

        }

    }

​

    private static void Test3(int? n)

    {

        int nn = n.Value;

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

        {

            stateNumber += nn;

        }

    }

}