Cascading Windows Using PInvoke

using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Collections;

namespace Cascading_Windows
{
	class Program
	{
		// The CascadeWindows function cascades the specified child windows of the specified parent window. It can be used to
		// cascade all windows (as in this example) or just the child windows of a specific window by passing in a handle to that
		// window. You can also define the rectangle wherein they should be cascaded.
		// See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/animatewindow.asp
		// for full documentation.
		[DllImport("user32.dll")]
		public static extern int CascadeWindows(int hWnd, int wHow, ref Rectangle lpRect, int cKids, ref ArrayList lpKids);

		static void Main(string[] args)
		{
			// As the function expects references to both a Rectangle and an ArrayList, we'll have to hack a couple of null values
			// as we can't pass null into the function.
			Rectangle nilRect = Rectangle.Empty;
			ArrayList nilList = null;

			// Cascade all windows that are children of the Desktop (handle = 0).
			CascadeWindows(0, 0, ref nilRect, 0, ref nilList);

			Console.Read();
		}
	}
}