using System class PlayGround static void Main string args Console Wri

using System;

class PlayGround
{
	static void Main(string[] args)
	{
		Console.WriteLine("Hello, world");
		PlayGround pg = new PlayGround();
	}

	public PlayGround()
	{
		this.CountdownCompleted += new EventHandler(this.Completed);
		this.OnCountdownCompleted(new EventArgs());
	}

	public event EventHandler CountdownCompleted;
	protected virtual void OnCountdownCompleted(EventArgs args)
	{
		if (CountdownCompleted != null) CountdownCompleted(this, args);
	}

	public void Completed(object sender, EventArgs args)
	{
		Console.WriteLine("object is {0} and args is {1}", sender, args);
	}
}