Call C++ Open MP from C# code

        static OMPCommon.TestCallback cb = new OMPCommon.TestCallback(Test);
        static void Main(string[] args)
        {
            OMPCommon.Helper.UseOMP(cb);
            Console.ReadLine();
        }
        static void Test(int i)
    {
        Console.WriteLine(i);
        Thread.Sleep(5000);
    }

// Set VS2008 C++ project Properties -->Configure --> C/C++ Language --> Support OpenMP
#include <omp.h>
#pragma once

using namespace System;

namespace OMPCommon {


 public delegate void TestCallback(int i);
 public ref class Helper
 {
 public:
  static void UseOMP(TestCallback^ cb)
  {
   omp_set_num_threads(10);
            #pragma omp parallel for
   for (int i=0;i<20; i++)
   {
    cb(i);
   }
  }
 };
}