3.5: Creating and reading Performance Counters.

Program.cs

using System;
using System.Diagnostics;

namespace _35_ApplicationDiagnostics
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Press ENTER to stop.");

            using (var performanceCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total"))
            {
                var text = "Processor Time: ";

                Console.WriteLine("Processor Time: ");

                do
                {
                    while(!Console.KeyAvailable)
                    {
                        Console.WriteLine(performanceCounter.NextValue());
                        Console.SetCursorPosition(text.Length, Console.CursorTop);
                    }
                } while (Console.ReadKey(true).Key != ConsoleKey.Enter);
            }

            Console.Read();
        }
    }
}