save windows form control to desktop wallpaper

control2wallpaper

/*
  example windows form code to save panel as bitmap
  and set that bitmap to wallpaper
*/
        private void DrawControlToImage(Control ctrl, Image img)
        {
            Rectangle sourceRect = ctrl.ClientRectangle;
            Size targetSize = new Size(img.Width, img.Height);
            using (Bitmap tmp = new Bitmap(sourceRect.Width, sourceRect.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
            {
                ctrl.DrawToBitmap(tmp, sourceRect);
                using (Graphics g = Graphics.FromImage(img))
                {
                    g.DrawImage(tmp, new Rectangle(Point.Empty, targetSize));
                }
            }
        }
        
        private void btnDraw_Click_1(object sender, EventArgs e)
        {
            Image img = new Bitmap(1024, 768);
            DrawControlToImage(pnlMain, img);
            img.Save(@"C:\test3_copy.jpg", ImageFormat.Jpeg);
            Wallpaper.Set(@"C:\test3_copy.jpg", Wallpaper.Style.Stretched);

            // Application.Exit();
        }
        
        
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32;

namespace DrawToForm
{
    public static class Wallpaper
    {
        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(string wpaper, Style style)
        {
            System.Drawing.Image img = System.Drawing.Image.FromFile(Path.GetFullPath(wpaper));
            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);
        }

    }
}