TPLDataflow6.cs

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

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

    var ab1 = new ActionBlock<string>(async s =>
    {
        await Task.Delay(900);
        Console.WriteLine("{0} from action block 1", s);
    }, new ExecutionDataflowBlockOptions { BoundedCapacity = 1 });

    var ab2 = new ActionBlock<string>(async s =>
    {
        await Task.Delay(600);
        Console.WriteLine("{0} from action block 2", s);
    }, new ExecutionDataflowBlockOptions { BoundedCapacity = 1 });

    var ab3 = new ActionBlock<string>(async s =>
    {
        await Task.Delay(300);
        Console.WriteLine("{0} from action block 3", s);
    }, new ExecutionDataflowBlockOptions { BoundedCapacity = 1 });

    var bufferBlock = new BufferBlock<string>();
    bufferBlock.LinkTo(ab1);
    bufferBlock.LinkTo(ab2);
    bufferBlock.LinkTo(ab3);

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

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