Detect hardware changes using WMI

program.cs

using System;
using System.Management;

namespace WMIDeviceChangeDetect
{
    public class WMIDeviceChangeDetect
    {

        private static void HandleEvent(object sender, EventArrivedEventArgs e)
        {
            int EventType = int.Parse(e.NewEvent.GetPropertyValue("EventType").ToString());

            //event types: http://msdn.microsoft.com/en-us/library/aa394124%28VS.85%29.aspx
            Console.Write("Win32_DeviceChangeEvent: ");
            switch (EventType)
            {
                case 1:
                    Console.WriteLine("Configuration changed");
                    break;

                case 2:
                    Console.WriteLine("Device Arrival");
                    break;

                case 3:
                    Console.WriteLine("Device Removal");
                    break;

                case 4:
                    Console.WriteLine("Docking");
                    break;

                default:
                    Console.WriteLine("Unknown event type!");
                    break;
            }
        }

        public static void Main()
        {
            try
            {
                WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent");
                ManagementEventWatcher watcher = new ManagementEventWatcher(query);
                watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);
                watcher.Start();

                Console.WriteLine("waiting for event...");
            }
            catch (ManagementException ex)
            {
                Console.WriteLine("ERROR: " + ex.Message);
            }

            Console.Read();
        }

    }
}