Untitled

private void SendMessage()
        {
            try
            {
                SerialPort sp = new SerialPort();
                sp.PortName = _port;
                sp.Open();
                sp.WriteLine("AT" + Environment.NewLine);
                Thread.Sleep(100);

                sp.WriteLine("AT+CMGF=1" + Environment.NewLine);
                Thread.Sleep(100);

                sp.WriteLine("AT+CMGS=\"" + guardiannumber + "\"" + Environment.NewLine);
                Thread.Sleep(100);

                sp.WriteLine($"Good day {guardianname}, greetings from Carmen National High School. Your son / daughter has {status} the school on {Now.ToString("dddd, dd MMMM yyyy")} at {Now:hh:mm tt}. This is a system generated message, please don't reply." + Environment.NewLine);
                Thread.Sleep(100);

                sp.Write(new byte[] { 26 }, 0, 1);
                Thread.Sleep(100);

                var response = sp.ReadExisting();
                if (response.Contains("ERROR"))
                {
                    _notifier.ShowError("Message was not sent! But the student was logged in the system successfully!");
                    //MessageBox.Show("Send failed", "Message", MessageBoxButton.OK, MessageBoxImage.Error);
                }
                else
                {
                    _notifier.ShowSuccess("A message was sent to your listed guardian.!");
                }
                sp.Close();
            }
            catch
            {
                _notifier.ShowError("Error: Communication port not configured! But the student was logged successfully");
            }
            
        }