C#

ArrayList oldArr = new ArrayList();
oldArr.AddRange( new string[] {"hello", "world!"} );

ArrayList newArr = new ArrayList(oldArr);
Console.WriteLine(newArr[0].ToString()); // outputs "hello"

ArrayList list = new ArrayList();
list.AddRange( new string[] {"hello", "world"} );

string[] tempArr = new string[2];
list.CopyTo(tempArr);
ArrayList list2 = new ArrayList(tempArr);
MessageBox.Show(list2[0].ToString()); // outputs "hello" 

private ArrayList Copy(ArrayList list)
{
  if (list == null) throw new ArgumentNullException("list");
  ArrayList copy = (ArrayList)list.Clone();
  for (int i=0; i<copy.Count; i++)
    if (copy[i] is ICloneable) copy[i] = ((ICloneable)copy[i]).Clone();
  return copy;
}

[Guid("c5bdd8d0-d26e-11ce-a89d-00aa006cadc5")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ITextHost
{
  IntPtr TxGetDC();
  IntPtr TxReleaseDC(IntPtr hdc);
  bool TxShowScrollBar(IntPtr fnBar, bool fShow);
  // ...
}

[DllImport("riched20.dll")]
private static extern int CreateTextServices(
  [MarshalAs(UnmanagedType.IUnknown)] object punkOuter,
  ITextHost pITextHost,
  [MarshalAs(UnmanagedType.IUnknown), Out] out object ppUnk);