C#

//Create MemoryStream out of the received bytes
                MemoryStream ImemoryStream = new MemoryStream(byteBuffer, 0, nReceived);
                //Next we create a BinaryReader out of the MemoryStream
                BinaryReader IbinaryReader = new BinaryReader(ImemoryStream);

                //The first eight bits of the IP header contain the version and
                //header length so we read them
                byteVersionAndHeaderLength = IbinaryReader.ReadByte();

                //The next eight bits contain the Differentiated services
                byteDifferentiatedServices = IbinaryReader.ReadByte();

                //Next eight bits hold the total length of the datagram
                ushortTotalLength = (ushort)IPAddress.NetworkToHostOrder(IbinaryReader.ReadInt16());

                //Next sixteen have the identification bytes
                ushortIdentification = (ushort)IPAddress.NetworkToHostOrder(IbinaryReader.ReadInt16());

                //Next sixteen bits contain the flags and fragmentation offset
                ushortFlagsAndOffset = (ushort)IPAddress.NetworkToHostOrder(IbinaryReader.ReadInt16());

                //Next eight bits have the TTL value
                byteTTL = IbinaryReader.ReadByte();

                //Next eight represnts the protocol encapsulated in the datagram
                byteProtocol = IbinaryReader.ReadByte();

                //Next sixteen bits contain the checksum of the header
                ushortChecksum = IPAddress.NetworkToHostOrder(IbinaryReader.ReadInt16());

                //Next thirty two bits have the source IP address
                uintSourceIPAddress = (uint)(IbinaryReader.ReadInt32());

                //Next thirty two hold the destination IP address
                uintDestinationIPAddress = (uint)(IbinaryReader.ReadInt32());

public sealed class Wallpaper<br />
    {<br />
        public Wallpaper() { }<br />
<br />
        const int SPI_SETDESKWALLPAPER = 20;<br />
        const int SPIF_UPDATEINIFILE = 0x01;<br />
        const int SPIF_SENDWININICHANGE = 0x02;<br />
<br />
        [DllImport("user32.dll", CharSet = CharSet.Auto)]<br />
        static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);<br />
<br />
        public enum Style : int<br />
        {<br />
            Tiled,<br />
            Centered,<br />
            Stretched<br />
        }<br />
<br />
        public static void Set(Uri uri, Style style)<br />
        {<br />
            System.IO.Stream s = new WebClient().OpenRead(uri.ToString());<br />
<br />
            System.Drawing.Image img = System.Drawing.Image.FromStream(s);<br />
            string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");<br />
            img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp);<br />
<br />
            RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);<br />
            if (style == Style.Stretched)<br />
            {<br />
                key.SetValue(@"WallpaperStyle", 2.ToString());<br />
                key.SetValue(@"TileWallpaper", 0.ToString());<br />
            }<br />
<br />
            if (style == Style.Centered)<br />
            {<br />
                key.SetValue(@"WallpaperStyle", 1.ToString());<br />
                key.SetValue(@"TileWallpaper", 0.ToString());<br />
            }<br />
<br />
            if (style == Style.Tiled)<br />
            {<br />
                key.SetValue(@"WallpaperStyle", 1.ToString());<br />
                key.SetValue(@"TileWallpaper", 1.ToString());<br />
            }<br />
<br />
            SystemParametersInfo(SPI_SETDESKWALLPAPER,<br />
                0,<br />
                tempPath,<br />
                SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);<br />
        }<br />
    }