public void SetSeenAppointments(AppointmentDTO appointmentDTO) { _iAppointmentBus.SetAppointmentsAsSeen(appointmentDTO.UserWhoSeenId, appointmentDTO.SeenAppointmentsIds); appointmentDTO.AllSeen = true; var send = JsonConvert.SerializeObject(appointmentDTO); _clients.FirstOrDefault(r => ((AppointmentWebSocketHandler)r)._userId == appointmentDTO.UserWhoSeenId).Send(send); }