USB NOTIFICATION

using System;
using System.IO;
using System.Management;
using System.Windows.Forms;

public partial class Form1 : Form
{
    // Used to subscribe to event notifications based on a specified event query.
    private ManagementEventWatcher _watcher = null;

    private StreamWriter _writer;

    private void Form1_Load(object sender, EventArgs e)
    {
        this.AddUSBHandler();
    }

    private void AddUSBHandler()
    {
        // Represents a WMI event query in WQL format (Windows Query Language)
        ManagementScope scope = new ManagementScope("root\\CIMV2");

        // Represents a scope (namespace)for management operations.		
        scope.Options.EnablePrivileges = true;

        try
        {
            WqlEventQuery query = new WqlEventQuery();

            query.EventClassName = "__InstanceCreationEvent";
            query.WithinInterval = new TimeSpan(0, 0, 3);
            query.Condition = @"TargetInstance ISA 'Win32_USBControllerdevice'";
            
            _watcher = new ManagementEventWatcher(scope, query);

            //adds event handler that’s is fired when the insertion event occurs
            _watcher.EventArrived += new EventArrivedEventHandler(USBInseted);

            //run the watcher
            _watcher.Start();
        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message);

            if (_watcher != null)
                _watcher.Stop();
        }

        using (FileStream stream = new FileStream(@"C:\USB_Log.txt", FileMode.Append))
        {
            _writer = new StreamWriter(stream);
        }
    }

    public void USBInseted(object sender, EventArgs e)
    {
        _writer.WriteLine("USB device is inserted at " + DateTime.Now.ToString());
    }

    // Important note: you should stop the watcher before exiting the application or else an excption is thrown  
    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (_watcher != null)
            _watcher.Stop();
    }

}

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