Events and Delegates Simplified

using System;

namespace Events
{
	public delegate void NumberReachedEventHandler(object sender, NumberReachedEventArgs e);

	/// <summary>
	/// Summary description for Counter.
	/// </summary>
	public class Counter
	{
		public event NumberReachedEventHandler NumberReached;
		
		public Counter()
		{
			//
			// TODO: Add constructor logic here
			//
		}
		public void CountTo(int countTo, int reachableNum)
		{
			if(countTo < reachableNum)
				throw new ArgumentException("reachableNum should be less than countTo");
			for(int ctr=0;ctr<=countTo;ctr++)
			{
				if(ctr == reachableNum)
				{
					NumberReachedEventArgs e = new NumberReachedEventArgs(reachableNum);
					OnNumberReached(e);
					return;//don't count any more
				}
			}
		}

		protected virtual void OnNumberReached(NumberReachedEventArgs e)
		{
			if(NumberReached!=null)
			{
				NumberReached(this, e);
			}
		}
	}

	public class NumberReachedEventArgs : EventArgs
	{
		private int _reached;
		public NumberReachedEventArgs(int num)
		{
			this._reached = num;
		}
		public int ReachedNumber
		{
			get
			{
				return _reached;
			}
		}
	}
}