events

[frazer]

hi i have this sample from msdn.

using System;
using System.Collecti ons;
namespace ListChangedEven ts
{
/// <summary>
/// Summary description for Class1.
/// </summary>
public delegate void ChangedEventHan dler(Object sender, EventArgs e);
public class ListWithChanged Event : ArrayList
{
public event ChangedEventHan dler Changed;
public ListWithChanged Event()
{
}
protected virtual void OnChanged(Event Args e)
{
Changed(this,e) ;
}
public override int Add(object value)
{
int i = base.Add(value) ;
OnChanged(Event Args.Empty);
return i;
}
public override void Insert(int index, object value)
{
base.Insert (index, value);
OnChanged(Event Args.Empty);
}

public override void Clear()
{
base.Clear();
OnChanged(Event Args.Empty);
}
public override object this[int index]
{
set
{
base[index] = value;
OnChanged(Event Args.Empty);
}
}
}
class EventListener
{
private ListWithChanged Event List;
public EventListener(L istWithChangedE vent list)
{
List = list;
// Add "ListChange d" to the Changed event on "List".
List.Changed += new ChangedEventHan dler(ListChange d);
}
// This will be called whenever the list changes.
private void ListChanged(obj ect sender, EventArgs e)
{
Console.WriteLi ne("This is called when the event fires.");
}
public void Detach()
{
// Detach the event and delete the list
List.Changed -= new ChangedEventHan dler(ListChange d);
List = null;
}
}
class Test
{
// Test the ListWithChanged Event class.
public static void Main()
{
// Create a new list.
ListWithChanged Event list = new ListWithChanged Event();
// Create a class that listens to the list's change event.
EventListener listener = new EventListener(l ist);
// Add and remove items from the list.
list.Add("item 1");
list.Clear();
listener.Detach ();
list.Insert(1," val");
//list.Add("item 2");
}
}
}

I want to do away with the Eventlistener class becos in a real world
application do we need this class. cant i listen to events from the
ListWithChanged Event class?
does that sound right?
thanx