Grid Vs Lists

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace Subscription___GridVsLists
{
    class Program
    {
        static Random rnd = new Random(42);

        /*Dict Setings
        const int its = 100000;
        const int maxID = 1000;
        const int ids = 200;
        */

        //Array Setings
        const int its = 100000;
        const int maxID = 100;
        const int ids = 10;

        static void Main(string[] args)
        {
            while (true)
            {
                List<int> randomIDs = new List<int>();

                for (int i = 0; i < 200; i++)
                {
                    randomIDs.Add(rnd.Next(maxID));
                }

                var dic = new Dictionary<int, int>(maxID);
                var arr = new int[maxID];
                var list = new SortedList<int, int>(maxID);

                foreach (var id in randomIDs)
                {
                    var value = rnd.Next();
                    dic[id] = value;
                    arr[id] = value;
                    list[id] = value;
                }

                var sw1 = Stopwatch.StartNew();
                long sumDic = 0;
                for (int i = 0; i < its; i++)
                {
                    foreach (var id in dic)
                    {
                        sumDic += id.Value;
                    }
                }
                sw1.Stop();

                var sw2 = Stopwatch.StartNew();
                long sumArr = 0;
                for (int i = 0; i < its; i++)
                {
                    foreach (var value in arr)
                    {
                        sumArr += value;
                    }
                }
                sw2.Stop();

                var sw3 = Stopwatch.StartNew();
                long sumList = 0;
                for (int i = 0; i < its; i++)
                {
                    foreach (var value in list)
                    {
                        sumList += value.Value;
                    }
                }
                sw3.Stop();

                Console.WriteLine("Arr: count - {0} in {1}ms", sumArr, sw2.ElapsedMilliseconds);

                Console.WriteLine("Dic: count - {0} in {1}ms", sumDic, sw1.ElapsedMilliseconds);

                Console.WriteLine("List: count - {0} in {1}ms", sumList, sw3.ElapsedMilliseconds);

                Console.ReadLine();
            }
        }

    }
}