IntPtrs and unsafe bit-twiddling : Pointer « unsafe « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. unsafe
3. Pointer

Pointers are variables that hold the addresses of other variables.

using System;
using System.IO;
using System.Reflection;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;

public class MainClass
{
    public unsafe static void Main()
    {
        int a = 10;
        Console.WriteLine("a is {0} ({0:X})", a);
        IntPtr ip = new IntPtr(&a);
        byte* pTarget = (byte*)ip.ToPointer() + 1;
        *pTarget = 2;

        Console.WriteLine("a is {0} ({0:X})", a);
    }
}

a is 10 (A)
a is 522 (20A)