gistfile1.cs

public class Guest : UntypedActor
    {
        private IActorRef _receptionist;

        public Guest()
        {
            var receptionist = Context.ActorSelection("/user/Klara");
            receptionist.Tell(new Identify("111"), Self);
        }

        protected override void OnReceive(object message)
        {
            if (message is ActorIdentity)
            {
                Console.WriteLine("Actor has an identity: " + message);
                _receptionist = ((ActorIdentity)message).Subject;
                Context.Watch(_receptionist);
            }
            else if (message.Equals("enter"))
            {
                Console.WriteLine("At the reception : {0} ", Self.Path.Name);

                var t = Task.Run(async () =>
                {
                    var t1 = _receptionist.Ask<Badge>(new BadgeRequest { Name = Self.Path.Name, LicensePlate = "AAA111" });
                    await Task.WhenAll(t1);

                    Console.WriteLine("Result of reception: " + t1.Result);
                    await Task.WhenAll(t1);
                    return t1.Result;
                });
                t.PipeTo(_receptionist, Self);
                //t.Wait();
            }
        }
    }
    
        public class Receptionist : UntypedActor
    {
        protected override void Unhandled(object message)
        {
            Console.WriteLine("Message received " + message);
        }

        protected override void OnReceive(object message)
        {
            Console.WriteLine("Message received " + message);
            if (message is ActorIdentity)
            {
                Console.WriteLine("Actor has an identity");
            }
            if (message is BadgeRequest)
            {
                Console.WriteLine("BadgeRequest from " + Sender.ToString());
                var badgeRequest = message as BadgeRequest;
                var badge = new Badge { 
                    Id = Guid.NewGuid(), 
                    Name = badgeRequest.Name, 
                    ValableOn = DateTime.Now,
                    DeliveredBy = Self.Path.Name
                };
                Sender.Tell(badge);
            }
        }
    }
    
        class Program
    {
        static void Main(string[] args)
        {
            var system = ActorSystem.Create("MySystem");
            //var accountant = system.ActorOf<Employee>("Geert");
            //accountant.Tell(true);

            //var plumber = system.ActorOf<Guest>("Verspecht");
            //plumber.Tell("FixPlumbing");
            var receptionist = system.ActorOf<Receptionist>("Klara");
            if (receptionist != null) { }

            var plumber = system.ActorOf<Guest>("Verspecht");
            plumber.Tell("enter");

            Console.ReadLine();
        }
    }