using System;

using System.Diagnostics;

​

namespace Rextester {

    public class Program {

        public static void Main(string[] args) {

            var string1 = Guid.NewGuid().ToString();

            var string2 = Guid.NewGuid().ToString();

            var string3 = new string(string1.ToCharArray());

​

            const int iterartions = 10000000;

            var timer = new Stopwatch();

            timer.Start();

            for (var i = 0; i < iterartions; i++) {

                if (string1.Equals(string2)) {

                }

            }

            timer.Stop();

            Console.WriteLine("instance Equals for different strings " + timer.Elapsed);

​

            timer.Reset();

            timer.Start();

            for (var i = 0; i < iterartions; i++) {

                if (string1.Equals(string3)) {

                }

            }

            timer.Stop();

            Console.WriteLine("instance Equals for same strings " + timer.Elapsed);

​

            timer.Reset();

            timer.Start();

            for (var i = 0; i < iterartions; i++) {

                if (string.Equals(string1, string2, StringComparison.Ordinal)) {

                }

            }

            timer.Stop();

            Console.WriteLine("static Equals for different strings " + timer.Elapsed);

​

            timer.Reset();

            timer.Start();

            for (var i = 0; i < iterartions; i++) {

                if (string.Equals(string1, string3, StringComparison.Ordinal)) {

                }

            }

            timer.Stop();

            Console.WriteLine("static Equals for same strings " + timer.Elapsed);

        }

    }

}

​