How to connect a gsm modem AUTOMATICALLY to available COM ports (without combobox)

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C#

modem

GSM

THIS QUESTION MAY SEAM A DUPLICATE, BUT NOT. after a long period of search on internet and no, result, then had to seek for assistance.

All solutions apply to loading available ports in a combo box and the user checks one at a go. But the automation feature then dies.
thus,
i'm looking for assistance on how the modem can connect automatically from the available ports without user interaction (USER FRIENDLINESS)

FOR THE COMBO BOX, IT IS WORKING FINE;

What I have tried:

using GsmComm.GsmCommunication;
using GsmComm.PduConverter;
using GsmComm.Server;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace COMM_All
{
    public partial class Comm_F : Form
    {
        public Comm_F()
        {
            InitializeComponent(); 
        }

        private void COM_PORTS()
        {
            string[] ports = SerialPort.GetPortNames();
            txtGPort1.Items.AddRange(ports);
            txtGPort2.Items.AddRange(ports);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            COM_PORTS(); 
        }

        private void Modem1_Click(object sender, EventArgs e)
        {
            if (txtGPort1.Text == "") { MessageBox.Show("Invalid Port Name"); return; }
            comm = new GsmCommMain(txtGPort1.Text, 9600, 8);
            Cursor.Current = Cursors.Default;

            bool retry;
            do
            {
                retry = false;
                try
                {
                    Cursor.Current = Cursors.WaitCursor; comm.Open(); Cursor.Current = Cursors.Default;
                    //MessageBox.Show("Modem Connected Sucessfully");
                     txtGStatus1.Text = "Connected Sucessfully";
                     comm.EnableMessageNotifications();
                     MessageBox.Show("Message notifications activated.");

                }
                catch (Exception)
                {
                    Cursor.Current = Cursors.Default;
                    if (MessageBox.Show(this, "GSM Modem is not available", "Check",
                        MessageBoxButtons.RetryCancel, MessageBoxIcon.Warning) == DialogResult.Retry)
                        retry = true; 
                    else { return; }
                }
            } while (retry);
  
      }
}
}