private void btnLogout_Click(object sender, EventArgs e)
        {
            ClearText();
            var message = _messageConstructor.LogoutMessage(MessageConstructor.SessionQualifier.QUOTE, _messageSequenceNumber);

            txtMessageSend.Text     = message;
            txtMessageReceived.Text = SendPriceMessage(message);
            _messageSequenceNumber  = 1;
        }
        //*************************************************************
        public ObservableCollection <string> Logout()
        {
            try
            {
                ObservableCollection <string> xReVal = new ObservableCollection <string>();

                string xOut = _MessageConstructor.LogoutMessage(MessageConstructor.SessionQualifier.QUOTE, _MessageSequenceNumber);
                string xIn  = SendMessage(xOut, _NetStream, true);
                xReVal.Add(xOut.Replace(Tool.SOH, '|'));
                xReVal.Add(xIn.Replace(Tool.SOH, '|'));


                return(xReVal);
            }
            catch (IOException ex)
            {
                throw ex;
            }
        }