public IEnumerable Handle(Func <Guid, ParticipantAggregate> al, AssignParticipantToRoom command)
        {
            var agg = al(command.Id);

            yield return(new ParticipantAssignedToRoom
            {
                Id = command.Id,
                RoomNumber = command.RoomNumber
            });
        }
        public JsonResult AssignToRoom(AssignParticipantToRoom command)
        {
            Domain.Dispatcher.SendCommand(command);

            return(Json(command));
        }