C#/.NET: Seriously Refresh Desktop Icons / Clear Desktop Icon Cache

Tested.
In use at work.

using System;
using System.Runtime.InteropServices;
using Microsoft.Win32;

namespace ConsoleApplication1
{
    class Program
    {

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern long SendMessageTimeout(
            int hWnd,
            int Msg,
            int wParam,
            string lParam,
            int fuFlags,
            int uTimeout,
            out int lpdwResult
        );


// http://www.programmingforums.org/post87847-9.html

        static void Main(string[] args)
        {

         // get the the original Shell Icon Size registry string value to 4
            RegistryKey k = Registry.CurrentUser.OpenSubKey("Control Panel").OpenSubKey("Desktop").OpenSubKey("WindowMetrics", true);
            Object OriginalIconSize = k.GetValue("Shell Icon Size");

         // set the Shell Icon Size registry string value to 4
            k.SetValue("Shell Icon Size", "33");
            k.Flush(); k.Close();

         // broadcast WM_SETTINGCHANGE to all window handles
            int res = 0;
            SendMessageTimeout(0xffff, 0x001A, 0, "", 0x0002, 5000, out res);
            //SendMessageTimeout(HWD_BROADCAST,WM_SETTINGCHANGE,0,"",SMTO_ABORTIFHUNG,5 seconds, return result to res)

         // set the Shell Icon Size registry string value to original value
            k = Registry.CurrentUser.OpenSubKey("Control Panel").OpenSubKey("Desktop").OpenSubKey("WindowMetrics", true);
            k.SetValue("Shell Icon Size", OriginalIconSize);
            k.Flush(); k.Close();

            SendMessageTimeout(0xffff, 0x001A, 0, "", 0x0002, 5000, out res);


        }
    }
}

Interesting