void IUser_NoReply.RegisterPairing(Domain.IUserPairingObserver observer)
        {
            var requestMessage = new RequestMessage {
                InvokePayload = new IUser_PayloadTable.RegisterPairing_Invoke {
                    observer = (UserPairingObserver)observer
                }
            };

            SendRequest(requestMessage);
        }
        public Task RegisterPairing(Domain.IUserPairingObserver observer)
        {
            var requestMessage = new RequestMessage {
                InvokePayload = new IUser_PayloadTable.RegisterPairing_Invoke {
                    observer = (UserPairingObserver)observer
                }
            };

            return(SendRequestAndWait(requestMessage));
        }