Implementing Observer pattern in .NET

using System;
using System.Collections.Generic;
using System.Text;

namespace ObserverPattern
{
    class CurrencyRateChangeObserver
    {
        //Reference to the watcher we�re working with
	    CurrencyRateWatcher  oCurrencyRateWatcher;
	
	    public CurrencyRateChangeObserver (CurrencyRateWatcher  cwr)
        {
            oCurrencyRateWatcher = cwr;
	
            // set up the delegate
            oCurrencyRateWatcher.OnRateChange += new CurrencyRateWatcher.CurrencyRateChange(RateHasChanged);
        }

        //The callback method
        public void RateHasChanged (object sender, CurrencyRateChangeInfo oInfo)
        {
           Console.WriteLine("Currency: �{0}� has new value �{1}� and the change Time is {2}", oInfo.sCurrencyName, oInfo.dNewRate, oInfo.tChangeTime);
        }



    }
}