public void EnumerateInstancesAsync(ManagementScope scope)
{
	try
	{
		// Instantiate an object searcher with the query.
		ManagementObjectSearcher searcher =
			new ManagementObjectSearcher(scope, new
			SelectQuery("CCM_InstalledComponent"));

		// Create a results watcher object
		// and handler for results and completion.
		ManagementOperationObserver results = new
			ManagementOperationObserver();

		// Attach handler to events for results and completion.
		results.ObjectReady += new
			ObjectReadyEventHandler(this.NewObject);
		results.Completed += new
			CompletedEventHandler(this.Done);

		Console.WriteLine("Installed Components");
		Console.WriteLine("--------------------");
		Console.WriteLine();

		// Call the asynchronous overload of Get()
		// to start the enumeration.
		searcher.Get(results);

		// Do something else while results
		// arrive asynchronously.
		while (!this.Completed)
		{
			System.Threading.Thread.Sleep(1000);
	}

		this.Reset();
}
	catch (ManagementException e)
	{
		Console.WriteLine("Failed to run query: " + e.Message);
		throw;
}

}

private bool isCompleted = false;

private void NewObject(object sender,
	ObjectReadyEventArgs obj)
{
	try
	{
		Console.WriteLine("Name: {0}, Version = {1}",
			obj.NewObject["DisplayName"],
			obj.NewObject["Version"]);
}
	catch (ManagementException e)
	{
		Console.WriteLine("Error: " + e.Message);
}

}

private bool Completed
{
	get
	{
		return isCompleted;
}
}

private void Reset()
{
	isCompleted = false;
}

private void Done(object sender,
		 CompletedEventArgs obj)
{
	isCompleted = true;
}