TPLDataflow1.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);
        });

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

    Console.WriteLine("Data Queued: {0}", ab.InputCount);
    while (ab.InputCount > 0) { }
    Console.WriteLine("Data Queued: {0}", ab.InputCount);
}