Getting unique system ID

UniqueSystemIdentifier.cs

using System;
using System.Management;

namespace UniqueSystemIdentifier
{
    class Program
    {
        private static string GetSystemID()
        {
            var search = new ManagementObjectSearcher(String.Format("SELECT * FROM Win32_Processor"));
            foreach (var manObj in search.Get())
            {
                return manObj.GetPropertyValue("ProcessorID").ToString();
            }
            throw new InvalidOperationException("Oh noes! There are no CPU!");
        }

        static void Main(string[] args)
        {
            Console.WriteLine(GetSystemID());
        }
    }
}