External device connection include bluetooth

To display a custom message when an external device is connected to a PC using a C# application, you can utilize the ManagementEventWatcher class from the System.Management namespace. This class allows you to monitor WMI events and execute code when a specific event occurs.

Here's an example of how you can achieve this:

using System;
using System.Management;

class Program
{
    static void Main(string[] args)
    {
        // Create a WMI query to monitor device connection events
        string query = "SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2";

        // Create a management event watcher with the query
        ManagementEventWatcher watcher = new ManagementEventWatcher(query);

        // Set the event handler for when a device connection event occurs
        watcher.EventArrived += DeviceConnected;

        // Start monitoring for device connection events
        watcher.Start();

        // Wait for user input to exit the program
        Console.WriteLine("Press any key to exit...");
        Console.ReadKey();

        // Stop monitoring for device connection events
        watcher.Stop();
    }

    static void DeviceConnected(object sender, EventArrivedEventArgs e)
    {
        // Get the device name from the event
        string deviceName = e.NewEvent.Properties["TargetInstance"].ToString();

        // Display a custom message to the user
        Console.WriteLine($"Device connected: {deviceName}");
    }
}

In this example, we create a ManagementEventWatcher object with a WMI query that filters for device connection events (EventType = 2). We then set an event handler (DeviceConnected) to execute code when a device connection event occurs. Inside the event handler, you can customize the code to display your desired custom message to the user.

Remember to add a reference to the System.Management assembly in your C# project.

This solution allows you to monitor and respond to external device connection events in real-time within your C# application.

Try below code:

using System;
using System.Management;

class Program
{
    static void Main()
    {
        // Set up a WMI event watcher to monitor USB device connection
        ManagementEventWatcher watcher = new ManagementEventWatcher();
        WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2");

        watcher.EventArrived += (sender, e) =>
        {
            ManagementBaseObject targetInstance = (ManagementBaseObject)e.NewEvent.Properties["TargetInstance"].Value;

            if (targetInstance != null)
            {
                string deviceName = targetInstance["Name"] as string;
                Console.WriteLine($"External device connected: {deviceName}");
                // You can display your custom message or perform other actions here
            }
        };

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

        Console.WriteLine("Press Enter to exit.");
        Console.ReadLine();

        watcher.Stop();
    }
}

Thanks

check if this helps

// Set up WMI event query to detect device connection events
string query = @"SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2";

// Create a management event watcher
using (ManagementEventWatcher watcher = new ManagementEventWatcher(query))
{
    // Register an event handler for the arrival of a new device
    watcher.EventArrived += (sender, e) =>
    {
        // Get the device name and description
        string deviceName = e.NewEvent.Properties["DeviceName"].Value.ToString();
        string deviceDescription = e.NewEvent.Properties["Description"].Value.ToString();

        Console.WriteLine($"External device connected!\nName: {deviceName}\nDescription: {deviceDescription}");

        // Add your custom logic here to display a custom message or perform any action
        // For example, you can use MessageBox.Show() to display a message box
    };

    // Start listening for events
    watcher.Start();

    Console.WriteLine("Listening for device connection events. Press Enter to exit.");
    Console.ReadLine();

    // Stop listening when the application is closed
    watcher.Stop();
}

How can get device name which was connected

Test this

        // Set up WMI event query to detect device connection events
        string query = @"SELECT * FROM Win32_DeviceChangeEvent WHERE EventType = 2";

        // Create a management event watcher
        using (ManagementEventWatcher watcher = new ManagementEventWatcher(query))
        {
            // Register an event handler for the arrival of a new device
            watcher.EventArrived += (sender, e) =>
            {
                Console.WriteLine("External device connected!");

                // Add your custom logic here to display a custom message or perform any action
                // For example, you can use MessageBox.Show() to display a message box
            };

            // Start listening for events
            watcher.Start();

            Console.WriteLine("Listening for device connection events. Press Enter to exit.");
            Console.ReadLine();

            // Stop listening when the application is closed
            watcher.Stop();
        }