int n = 10;
            short []tab = new short[n];
            Random rand = new Random();

            Parallel.For(0, n, i =>
            {
                tab[i] = (short)rand.Next(0, 5);
            });

            long total = 0;
            Parallel.For<short>(0, n, () => 0, (j, loop, subtotal) =>
            {
                subtotal += tab[j];
                return subtotal;
            },
                (x) => Interlocked.Add(ref total, x)
            );
            Console.WriteLine("Suma {0}", total);
            Console.ReadKey();