Answer by Matthew Whited for Quickest Method to Reverse in String in C#.net

The Stopwatch class needs reset after each run. the code below has been corrected

var d = s.ToCharArray();Array.Reverse(d);return s == new string(d);

using System;using System.Diagnostics;namespace longeststring_codegolf{    class Program    {        static void Main(string[] args)        {            int t = 0, v = 0;            var sw = new Stopwatch();            sw.Start();            for (int i = 999; i > 99; i--)                for (int j = 999; j > 99; j--)                    if ((v = i * j) > t && IsPalindromicMine(v.ToString()))                        t = v;            sw.Stop();            var elapsed = sw.Elapsed;            var elapsedMilliseconds = sw.ElapsedMilliseconds;            var elapsedTicks = sw.ElapsedTicks;             Console.WriteLine("Ticks: "+ elapsedTicks.ToString());//~189000            Console.WriteLine("Milliseconds: "+ elapsedMilliseconds.ToString()); //~9            sw = Stopwatch.StartNew();            for (int i = 999; i > 99; i--)                for (int j = 999; j > 99; j--)                    if ((v = i * j) > t && IsPalindromic(v.ToString()))                        t = v;            sw.Stop();            var elapsed2 = sw.Elapsed;            var elapsedMilliseconds2 = sw.ElapsedMilliseconds;            var elapsedTicks2 = sw.ElapsedTicks;             Console.WriteLine("Ticks: "+ elapsedTicks2.ToString());//~388000            Console.WriteLine("Milliseconds: "+ elapsedMilliseconds2.ToString());//~20        }        static bool IsPalindromicMine(string s)        {            var d = s.ToCharArray();            Array.Reverse(d);            return s == new string(d);        }        static bool IsPalindromic(string s)        {            int len = s.Length;            int half = len-- >> 1;            for (int i = 0; i < half; i++)                if (s[i] != s[len - i])                    return false;            return true;        }    }}