Testing Different Loops (C#)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

/*
Testing different loops against each other.
Measured in ticks.
A tick is 100 nanoseconds.

Linq Select         :     239267
Linq Sum            :     241414
Linq ForEach        :      94188
ForEach             :      85663
For                 :     118767
ForWithNoVariables  :     148726
*/

namespace Test
{
    public class Program
    {
        const int N_STYLES = 6;
        const int N_TESTS = 100;
        const int N_DOUBLES_PER_TEST = 1000000;
        static String[] STYLE_NAMES = { "Linq Select", "Linq Sum", "Linq ForEach", "ForEach", "For", "ForWithNoVariables" };
        public static void Main(string[] args)
        {
            for (int i = 0; i < N_STYLES; i++)
                times.Add(new List<double>());

            for (int i = 0; i < N_TESTS; i++)
                Test();

            for (int i = 0; i < N_STYLES; i++)
                Console.WriteLine(String.Format("{0,-20}", STYLE_NAMES[i])+": "+String.Format("{0,10}", Math.Round(times[i].Average())));

            Console.ReadLine();
        }
        static List<List<double>> times = new List<List<double>>();
        public static void Test()
        {
            Random r = new Random();
            List<double> list = new List<double>();
            for (int i = 0; i < N_DOUBLES_PER_TEST; i++)
                list.Add(r.NextDouble());

            List<DateTime> timers = new List<DateTime>();

            timers.Add(DateTime.Now);

            LinqSelectStyle(list);

            timers.Add(DateTime.Now);

            LinqSumStyle(list);

            timers.Add(DateTime.Now);

            LinqForEachStyle(list);

            timers.Add(DateTime.Now);

            ForEachStyle(list);

            timers.Add(DateTime.Now);

            ForStyle(list);

            timers.Add(DateTime.Now);

            ForStyleNoVariable(list);

            timers.Add(DateTime.Now);

            for (int i = 0; i < N_STYLES; i++)
            {
                double t = timers[i + 1].Ticks - timers[i].Ticks;
                times[i].Add(t);
            }
        }

        static void LinqSelectStyle(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            avg = list.Average();
            sum = list.Select(v => (v - avg) * (v - avg)).Sum();
        }

        static void LinqSumStyle(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            avg = list.Average();
            sum = list.Sum(v => (v - avg) * (v - avg));
        }

        static void LinqForEachStyle(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            list.ForEach(delegate (double v) { avg += v; }); avg /= list.Count;
            list.ForEach(delegate (double v) { sum += (v - avg) * (v - avg); });
        }

        static void ForEachStyle(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            foreach (double v in list)
                avg += v;
            avg /= list.Count;
            foreach (double v in list)
                sum += (v - avg) * (v - avg);
        }

        static void ForStyle(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            for (int i = 0; i < list.Count; i++)
            {
                double v = list[i];
                avg += v;
            }
            avg /= list.Count;
            for (int i = 0; i < list.Count; i++)
            {
                double v = list[i];
                sum += (v - avg) * (v - avg);
            }
        }

        static void ForStyleNoVariable(List<double> list)
        {
            double avg, sum;
            avg = sum = 0;
            for (int i = 0; i < list.Count; i++)
            {
                avg += list[i];
            }
            avg /= list.Count;
            for (int i = 0; i < list.Count; i++)
            {
                sum += (list[i] - avg) * (list[i] - avg);
            }
        }
    }
}