Byte Writing Performance

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

namespace ExampleConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            // Store averages
            var loops = new List<long>();
            var buffers = new List<long>();

            // Create a stopwatch for performance testing
            var stopwatch = new Stopwatch();
            // Test content
            var data = GetTestingBytes();

            for(int i = 0; i < 1000; i++)
            {
                // Looping Test
                using (var s1 = new MemoryStream())
                {
                    stopwatch.Start();
                    foreach (var item in data)
                    {
                        s1.WriteByte(item);
                    }
                    stopwatch.Stop();
                    loops.Add(stopwatch.ElapsedTicks);
                }

                // Buffered Test
                using (var s2 = new MemoryStream())
                {
                    stopwatch.Start();
                    s2.Write(data, 0, data.Length);
                    stopwatch.Stop();
                    buffers.Add(stopwatch.ElapsedTicks);
                }
            }

            // Get averages
            var avgLoop = new TimeSpan((long)loops.Average());
            var avgBuffer = new TimeSpan((long)buffers.Average());

            Console.WriteLine($"Average Loop Test: {avgLoop}");
            Console.WriteLine($"Average Buffer Test: {avgBuffer}");
            Console.Read();
        }

        static byte[] GetTestingBytes()
        {
            var str = String.Join(",", Enumerable.Range(0, 1000).Select(x => Guid.NewGuid()).ToArray());
            byte[] bytes = new byte[str.Length * sizeof(char)];
            System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
            return bytes;
        }

    }
}