Interacting with the Hardware using C# 4.0

Get OS, Service Pack Information

Use the System.Environment.OSVersion

OperatingSystem os = System.Environment.OSVersion;

Console.WriteLine("Platform: {0}", os.Platform);

Console.WriteLine("Service Pack: {0}", os.ServicePack);

Console.WriteLine("Version: {0}", os.Version);

Console.WriteLine("VersionString: {0}", os.VersionString);

Console.WriteLine("CLR Version: {0}", System.Environment.Version); 

This produces the following output (on my Windows 7 system):

Platform: Win32NT
Service Pack:
Version: 6.1.7600.0
VersionString: Microsoft Windows NT 6.1.7600.0
CLR Version: 4.0.21006.1

The version information is in a struct, so you can make decisions based on version or subversion values.

Get CPU and Other Hardware Information

using System;

using System.Management;

using System.Windows.Forms;

namespace HardwareInfo

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Machine: {0}", Environment.MachineName);

            Console.WriteLine("# of processors (logical): {0}", Environment.ProcessorCount);

            Console.WriteLine("# of processors (physical): {0}", CountPhysicalProcessors());

            Console.WriteLine("RAM installed: {0:N0} bytes", CountPhysicalMemory());

            Console.WriteLine("Is OS 64-bit? {0}", Environment.Is64BitOperatingSystem);

            Console.WriteLine("Is process 64-bit? {0}", Environment.Is64BitProcess);

            Console.WriteLine("Little-endian: {0}", BitConverter.IsLittleEndian);

            foreach (Screen screen in System.Windows.Forms.Screen.AllScreens)

            {

                Console.WriteLine("Screen {0}", screen.DeviceName);

                Console.WriteLine("\tPrimary {0}", screen.Primary);

                Console.WriteLine("\tBounds: {0}", screen.Bounds);

                Console.WriteLine("\tWorking Area: {0}", screen.WorkingArea);

                Console.WriteLine("\tBitsPerPixel: {0}", screen.BitsPerPixel);

            }

            Console.ReadKey();

        }

        private static UInt32 CountPhysicalProcessors()

        {

            //you must add a reference to the System.Management assembly

            ManagementObjectSearcher objects =

            new ManagementObjectSearcher(

            "SELECT * FROM Win32_ComputerSystem");

            ManagementObjectCollection coll = objects.Get();

            foreach (ManagementObject obj in coll)

            {

                return (UInt32)obj["NumberOfProcessors"];

            }

            return 0;

        }

        private static UInt64 CountPhysicalMemory()

        {

            ManagementObjectSearcher objects =

            new ManagementObjectSearcher(

            "SELECT * FROM Win32_PhysicalMemory");

            ManagementObjectCollection coll = objects.Get();

            UInt64 total = 0;

            foreach (ManagementObject obj in coll)

            {

                total += (UInt64)obj["Capacity"];

            }

            return total;

        }

    }

}