TPLDataflow5.cs

static void Main(string[] args)
{
    Console.Title = "TPL Dataflow";

    var source = new[] { 
        "elemarjr", "leandronet", "vquaiato", 
        "juanplopes", "rodrigovidal", "cleytonferrari", 
        "diogodamiani", "sricanesh", "rodrigokono" 
    };

    var ab = new ActionBlock<string>(async s =>
        {
            await Task.Delay(200);
            Console.WriteLine(s);
        });

    var tb = new TransformBlock<string, string>(s =>
        {
            return s.ToUpper();
        });

    tb.LinkTo(ab);

    var tb2 = new TransformBlock<string, string>(s =>
        {
            return new string(s.Reverse().ToArray());
        });

    tb2.LinkTo(tb);

    foreach (var item in source)
        tb2.Post(item);

    Console.WriteLine("Waiting..."); 
    Console.Read();
}