getCom.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.IO;
using System.IO.Ports;
using System.Linq;
using System.Management;
using System.Windows.Forms;

namespace ConsoleApp1
{
    class Program
    {
        private static string AutodetectComPort()
        {
            ManagementScope connectionScope = new ManagementScope();
            SelectQuery serialQuery = new SelectQuery("SELECT * FROM Win32_SerialPort");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(connectionScope, serialQuery);

            try
            {
                foreach (ManagementObject item in searcher.Get())
                {
                    string desc = item["Description"].ToString();
                    string deviceId = item["DeviceID"].ToString();

                    if (desc.Contains("Устройство с последовательным интерфейсом USB"))
                    {
                        return deviceId;
                    }
                }
            }
            catch (ManagementException e)
            {
                /* Do Nothing */
            }

            return null;
        }
        public enum EventType
        {
            Inserted = 2,
            Removed = 3
        }
        static void Main(string[] args)
        {
            ManagementEventWatcher watcher = new ManagementEventWatcher();
            WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2 or EventType = 3");

            watcher.EventArrived += (s, e) =>
            {
                EventType eventType = (EventType)(Convert.ToInt16(e.NewEvent.Properties["EventType"].Value));
                string eventName = Enum.GetName(typeof(EventType), eventType);
                Console.WriteLine("{0}: {1}", DateTime.Now, eventName);

                Console.WriteLine(AutodetectComPort());
            };

            watcher.Query = query;
            watcher.Start();

            Console.ReadLine();
        }
    }
}