C#

using System;
using System.Collections;

namespace FreeForAll {
  public class FirmList : IEnumerable {
    ArrayList foundation;

    public FirmList(ArrayList source) {
      foundation = source;
    }

    public IEnumerator GetEnumerator() {
      return foundation.GetEnumerator();
    }

    public bool Contains(object item) {
      return foundation.Contains(item);
    } 

    public int Count {
      get { return foundation.Count; }
    }
  }
}

class A {
  ArrayList TheRealList = new ArrayList();
  FirmList TheFirmList;
  A() {  // constructor
    TheFirmList = new FirmList(TheRealList);
  }
  ...
  void SomeFunctionThatAddsMembersToTheArrayList() {...};
  ...
  public FirmList SomeList {
    get { return TheFirmList; }
  }
}

A aaa = new A();
aaa.SomeFunctionThatAddsMembersToTheArrayList();
FirmList list = A.SomeList;
foreach (object o in list) {
  ...
}
WriteLine("{0}", list.Count);
if (list.Contains(...)) {...

<br />
this.FormClosing += new FormClosingEventHandler(MyForm_FormClosing);<br />

<br />
        void MyForm_FormClosing(object sender, FormClosingEventArgs e)<br />
        {<br />
            DialogResult a = MessageBox.Show("Are you sure you want to close the program?","Cancel",MessageBoxButtons.YesNo);<br />
            if (a == DialogResult.No)<br />
                e.Cancel = true;<br />
        }<br />

this.FormClosing += new FormClosingEventHandler(MyForm_FormClosing);

class A
    {
        public PointF[] points = new PointF[1000000];
    }
    public class Test
    {
        public static void Main()
        {
            Console.ReadLine();
            A a = new A();
            Console.ReadLine();
            a = null; //Setting a.points=null didn't make any difference
            GC.Collect();
            Console.ReadLine();
        }
    }