Simple Sample To Use Performance Counter

SimplePerformanceCounter.cs

using System;

namespace PerformanceCounter
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var counter = new System.Diagnostics.PerformanceCounter("Memory", "Available MBytes"))
            {
                float counterValue = counter.NextValue();
                Console.WriteLine(counterValue);
                // or you can do whatever you want with the value
            }
        }
    }
}