pinning byte[] before page alignment calculation

StrupHash.cs

using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace StrupHash
{
	class Program
	{
		static unsafe void Main(string[] args)
		{
			for (; ; )
			{
				const Int32 PageSize = 4096;
				var bytes = new Byte[PageSize * 2 - 1];
				using var pinnedMemoryHandle = bytes.AsMemory().Pin();

				var pBytes = new IntPtr(Unsafe.AsPointer(ref bytes[0])).ToInt64();
				var alignmentOffBy = pBytes % PageSize;
				var pageAligned = alignmentOffBy == 0 ? pBytes : pBytes + (PageSize - alignmentOffBy);
				Debug.Assert(pageAligned % PageSize == 0);
				var pPageAligned = (Byte*)new IntPtr(pageAligned).ToPointer();
				pPageAligned[0] = 255;
				var bytesAligned = MemoryMarshal.CreateSpan(ref Unsafe.AsRef<Byte>(pPageAligned), PageSize);
				for (var i = 0; i != bytes.Length; i++)
					if (bytes[i] == 255)
						Console.WriteLine(i + ": " + bytes[i]);
			}
		}
	}
}