usbmonitor

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Management;
using System.Diagnostics;



namespace ConsoleApplication1
{
    class Program
    {

        static void Main(string[] args)
        {

            List<String> prec = query();

            while (true)
            {
                System.Threading.Thread.Sleep(1000);

                List<String> succ = query();

                if (succ.Count > prec.Count)
                {
                    checknexecute(succ, prec);
                }
                prec = null;


                prec = succ;
                succ = null;

                GC.Collect();
            }

        }


        static List<String> query()
        {
            List<String> lsusb = new List<string>();
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT deviceid FROM cim_logicaldevice");
            ManagementObjectCollection usb = searcher.Get();

            foreach (ManagementObject obj in usb)
            {
                lsusb.Add(obj.Properties["deviceid"].Value.ToString());
            }

            searcher.Dispose();
            usb.Dispose();
            GC.Collect();

            return lsusb;

        }


        static void checknexecute(List<String> succ, List<String> prec)
        {
            foreach (String usbid in succ)
            {
                if (!prec.Contains(usbid))
                {
                    File.AppendAllText("log.log", "PLUGGED " + DateTime.Now.ToString() + " --- " + usbid + "\r\n");

                }
            }
            File.AppendAllText("log.log", "\r\n");
            succ = null;
            prec = null;
            GC.Collect();
        }

    }
}