Class To Change Wallpaper In Xp,Vista,Windows 7 From C#.Net

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using Microsoft.Win32;
using System.Drawing;

public sealed  class clsWallpaper
{

const int SPI_SETDESKWALLPAPER = 20;
const int SPIF_UPDATEINIFILE = 0x01;
const int SPIF_SENDWININICHANGE = 0x02;

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

public enum Style : int
{
Tiled,
Centered,
Stretched
}

public static void Set(Uri uri, Style style)
{
System.IO.Stream s = new System.Net.WebClient().OpenRead(uri.ToString());

System.Drawing.Image img = System.Drawing.Image.FromStream(s);
string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");
img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp);

RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);
if (style == Style.Stretched)
{
key.SetValue(@"WallpaperStyle", 2.ToString());
key.SetValue(@"TileWallpaper", 0.ToString());
}

if (style == Style.Centered)
{
key.SetValue(@"WallpaperStyle", 1.ToString());
key.SetValue(@"TileWallpaper", 0.ToString());
}

if (style == Style.Tiled)
{
key.SetValue(@"WallpaperStyle", 1.ToString());
key.SetValue(@"TileWallpaper", 1.ToString());
}

SystemParametersInfo(SPI_SETDESKWALLPAPER,
0,
tempPath,
SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
}

}