2 loops vs 1 loops

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(String[] args) {

            const int size = 32;
            var runcount = Math.Pow(10, 6);

            var arrb = new Boolean[size];
            var arrb2 = new Boolean[size];
            var links = new List<Int32>();

            for (int i = 0; i < arrb.Length; i += 2)
                links.Add(i);

            var t = new Stopwatch();
            t.Start();
            for (int i = 0; i < runcount; ++i)
                proc1(arrb, links);
            t.Stop();
            Console.WriteLine("time1 {0} ns", t.ElapsedMilliseconds / runcount * 1000);


            t = new Stopwatch();
            t.Start();
            for (int i = 0; i < runcount; ++i)
                proc2(arrb2, links);
            t.Stop();
            Console.WriteLine("time2 {0} ns", t.ElapsedMilliseconds / runcount * 1000);

            Console.WriteLine("results equals = {0}", arrb2.SequenceEqual(arrb));

            Console.ReadKey();
        }

        public static void proc1(Boolean[] arrb, List<Int32> links) {
            var j = 0;
            for (var i = 0; i < arrb.Length; ++i)
                if (links.Count > j && links[j] == i) {
                    arrb[i] = true;
                    j++;
                } else arrb[i] = false;

        }

        public static void proc2(Boolean[] arrb, List<Int32> links) {
            for (int i = 0; i < arrb.Length; ++i)
                arrb[i] = false;

            foreach (var l in links)
                arrb[l] = true;
        }
    }
}