public class BlockingTest
    {
        BlockingCollection<int> bc = new BlockingCollection<int>();
        public BlockingTest()
        {
            Task.Factory.StartNew(ProduceTask);
            Task.Factory.StartNew(ConsumeTask);
        }

        private void ProduceTask()
        {
            foreach (var item in Enumerable.Range(1, 100))
            {
                Console.WriteLine(string.Format("+++++++++++++: {0}", item));
                bc.Add(item);
            }
            bc.CompleteAdding();
        }

        private void ConsumeTask()
        {
            foreach(var item in bc.GetConsumingEnumerable())
            {
                Console.WriteLine(string.Format("---------------: {0}", item));
            }
        }
    }