using System.Diagnostics;
class Program {
   static void DisplayJITCounters() {
      PerformanceCounterCategory perfCategory
                = new PerformanceCounterCategory(".NET CLR Jit");
      PerformanceCounter[] perfCounters;
      perfCounters = perfCategory.GetCounters("MyAssembly");
      foreach(PerformanceCounter perfCounter in perfCounters)
         System.Console.WriteLine("{0}:{1}",
            perfCounter.CounterName,
            perfCounter.NextValue());
   }
   static void f() {
      System.Console.WriteLine("----> Calling f().");
   }
   static void Main() {
      DisplayJITCounters();
      f();
      DisplayJITCounters();
   }
}