.NET process affinity test

Program.cs

using System;
using System.Diagnostics;
using System.Threading;

namespace procaff
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            // only use first logical processor for this process
            Process proc = Process.GetCurrentProcess();
            ProcessThread thread = proc.Threads[0];
            thread.IdealProcessor = 0;
            thread.ProcessorAffinity = (IntPtr)1;

            Console.WriteLine(Environment.ProcessorCount);

            ConsumeCPU(90);
        }

        // https://stackoverflow.com/a/2514697
        public static void ConsumeCPU(int percentage)
        {
            if (percentage < 0 || percentage > 100)
                throw new ArgumentException("percentage");
            Stopwatch watch = new Stopwatch();
            watch.Start();            
            while (true)
            {
                // make the loop go on for "percentage" milliseconds then sleep the remaining
                // percentage milliseconds. So 40% utilization means work 40ms and sleep 60ms
                if (watch.ElapsedMilliseconds > percentage)
                {
                    Thread.Sleep(100 - percentage);
                    watch.Reset();
                    watch.Start();
                }
            }
        }
    }
}