BlockingQueue.Enqueue C# (CSharp) Method

        public void Enqueue(T data)
        {
            if (data == null) throw new ArgumentNullException("data");
            lock (_queue)
            {
                _queue.Enqueue(data);
                Monitor.Pulse(_queue);
                 }
    		}
            public T Dequeue()

        public void EnqueueBeforeDequeueTest()
        {
            var queue = new BlockingQueue<object>();
            var isEnqueued = new ManualResetEvent(false);
            var isDequeued = new ManualResetEvent(false);

            object value = null;

            ThreadPool.QueueUserWorkItem(_ =>
            {
                queue.Enqueue(new object());
                isEnqueued.Set();
            });
            ThreadPool.QueueUserWorkItem(_ =>
            {
                isEnqueued.WaitOne();
                value = queue.Dequeue();
                isDequeued.Set();
            });

            if (!isDequeued.WaitOne(10))
                Assert.Fail("Dequeue after Enqueue failed: Event hasn't been raised");

            if(value == null)
                Assert.Fail("Dequeue after Enqueue failed: Wrong value returned");
        }