using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;

public class MemoryRead
{
    const int PROCESS_WM_READ = 0x0010;

    [DllImport("kernel32.dll")]
    public static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);

    [DllImport("kernel32.dll")]
    public static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress, byte[] lpBuffer, int dwSize, ref int lpNumberOfBytesRead);

    public static void Main()
    {

        Process process = Process.GetProcessesByName("notepad")[0];
        IntPtr processHandle = OpenProcess(PROCESS_WM_READ, false, process.Id);

        int bytesRead = 0;
        byte[] buffer = new byte[24]; //'Hello World!' takes 12*2 bytes because of Unicode

        // 0x0046A3B8 is the address where I found the string, replace it with what you found
        ReadProcessMemory((int)processHandle, 0x0046A3B8, buffer, buffer.Length, ref bytesRead);

        Console.WriteLine(Encoding.Unicode.GetString(buffer) + " (" + bytesRead.ToString() + "bytes)");
        Console.ReadLine();
    }
}