Custom List with OnAdd Event

using System;

using System.Collections.Generic;

namespace Event

{

    class Program

    {

        static void Main(string[] args)

        {

            CustomList<int> list = new CustomList<int>();

            list.OnAdd += new EventHandler<CustomEventArgs<int>>(OnListAdd);

            list.Add(1);

        }

        static void OnListAdd(object sender, CustomEventArgs<int> e)

        {

            Console.WriteLine("Item: {0} added...", e.Item);

        }

    }

    class CustomList<T> : List<T>

    {

        public event EventHandler<CustomEventArgs<T>> OnAdd;

        public void Add(T item)

        {

            if (null != OnAdd)

            {

                CustomEventArgs<T> args = new CustomEventArgs<T>() { Item = item };

                OnAdd(this, args);

            }

            base.Add(item);

        }

    }

    class CustomEventArgs<T> : EventArgs

    {

        public T Item { get; set; }

    }

}