How to send SMS from Winform Application to Mobile phone using C#???

using System.IO.Ports;

SerialPort srpModemPort = null;

            string port_name = "COM1";
            srpModemPort = new SerialPort();
            srpModemPort.PortName = port_name;
            srpModemPort.BaudRate = 115200;
            srpModemPort.Parity = Parity.None;
            srpModemPort.DataBits = 8;
            srpModemPort.StopBits = StopBits.One;
            srpModemPort.Handshake = Handshake.RequestToSend;
            srpModemPort.DtrEnable = true;
            srpModemPort.RtsEnable = true;
            srpModemPort.NewLine = System.Environment.NewLine;
            srpModemPort.WriteTimeout = 2000;

Then you can send sms by this ->

            string mobile_number = "+88XXXXXXXXXXX";
            string message = "Hi";
           
            try
            {
                if (!srpModemPort.IsOpen)
                    srpModemPort.Open();
                srpModemPort.WriteLine("AT+CMGS=" + mobile_number + "\r" + message + (char)(26));

                MessageBox.Show("Message Send.....");

            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }