var sum1 = 0;
            var eh1 = new ManualResetEvent(false);
            ThreadPool.QueueUserWorkItem(h =>
            {
                for (var i = 2; i <= 100; i += 2)
                    sum1 += i;
                eh1.Set();
            });
            var sum2 = 0;
            var eh2 = new ManualResetEvent(false);
            ThreadPool.QueueUserWorkItem(h =>
            {
                for (var i = 1; i <= 100; i += 2)
                    sum2 += i;
                eh2.Set();
            });
            WaitHandle.WaitAll(new WaitHandle[] { eh1, eh2 });