C#

RegistryKey HKLM = Registry.LocalMachine;
String CurrentVersionPath = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\";
String ProductId = (String)CurrentVersionKey.GetValue("ProjectId");

String BuildGUID = (String)CurrentVersionKey.GetValue("BuildGUID");
Console.Write(String.Format("Registry value for {0}: {1}\n\n", "BuildGUID", BuildGUID));

using System;
using Microsoft.Win32;

namespace RegistryValues
{
    class Program
    {
        static void Main(string[] args)
        {
            RegistryKey HKLM = Registry.LocalMachine;
            String CurrentVersionPath = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\";

            RegistryKey CurrentVersionKey = HKLM.OpenSubKey(CurrentVersionPath);
            if (CurrentVersionKey == null)
            {
                Console.WriteLine("Bad CurrentVersion registry key");
                Console.Read();
                return;
            } // if (CurrentVersion == null)

            String[] names = CurrentVersionKey.GetValueNames();
            Int16 i = 0;
            foreach (String name in names)
            {
                Console.WriteLine(String.Format("{0}\t{1}", ++i, name));
            } // foreach (String name in names)
            Console.WriteLine("\n");
            HKLM.Close();
            Console.Read();
        } // static void Main(string[] args)
    } // class Program
} // namespace RegistryValues