C#

public class SimpleClassList
{
  private ArrayList list;
  public event ItemChangedEventHandler ItemChanged;
  protected virtual void OnItemChanged(ItemChangedEventArgs e)
  {
    if (ItemChanged != null)
      ItemChanged(this, e);
  }
  public SimpleClass this[int index]
  {
    get { return list[index] as SimpleClass; }
    set
    {
      list[index] = value;
      OnItemChanged(new ItemChangedEventArgs(index));
    }
  }
}
public class ItemChangedEventArgs : EventArgs
{
  public ItemChangedEventArgs(int index)
  {
    this.index = index;
  }
  private int index;
  public int Index
  {
    get { return index; }
  }
}
public delegate void ItemChangedEventHandler(object sender,
  ItemChangedEventArgs e);

simpleClassList1.ItemChanged +=
  new ItemChangedEventHandler(OnItemChanged);
//...
private void OnItemChanged(object source, ItemChangedEventArgs e)
{
  SimpleClassList list = source as SimpleClassList;
  if (list != null)
  {
    Console.WriteLine(list[e.Index].Position);
  }
}

DataObject do = new DataObject(DataFormats.FileDrop, filename);
this.DoDragDrop(do, DragDropEffects.Copy);

DataObject do = new DataObject(DataFormats.FileDrop, filename);

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Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

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using System;

public abstract class Test
{
    private Test()
    {
    }

    protected Test(string name)
    {
    }
}

public class Test2 : Test
{
    protected Test2(string name) : base(name)
    {
    }
}