Romit with C#.net Code

public static Bitmap MakeGrayscale(Bitmap original)

  //make an empty bitmap the same size as original

  Bitmap newBitmap = new Bitmap(original.Width, original.Height);

  for (int i = 0; i < original.Width; i++)

      for (int j = 0; j < original.Height; j++)

          //get the pixel from the original image

          Color originalColor = original.GetPixel(i, j);

          //create the grayscale version of the pixel

          int grayScale = (int)((originalColor.R * .3) + (originalColor.G * .59)

              + (originalColor.B * .11));

          //create the color object

          Color newColor = Color.FromArgb(grayScale, grayScale, grayScale);

          //set the new image's pixel to the grayscale version

          newBitmap.SetPixel(i, j, newColor);

  return newBitmap;

//necessary function to create bitmap of form

        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]

        public static extern IntPtr GetDC(IntPtr hWnd);

        [DllImport("user32.dll", ExactSpelling = true)]

        public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [DllImport("gdi32.dll", ExactSpelling = true)]

        public static extern IntPtr BitBlt(IntPtr hDestDC, int x, int y,

             int nWidth, int nHeight, IntPtr hSrcDC,

             int xSrc, int ySrc, int dwRop);

        public static Bitmap GetFormImage(System.Windows.Forms.Form frm)

            Graphics g = frm.CreateGraphics();

            Size s = frm.Size;

            Bitmap formImage = new Bitmap(s.Width, s.Height, g);

            Graphics mg = Graphics.FromImage(formImage);

            IntPtr dc1 = g.GetHdc();

            IntPtr dc2 = mg.GetHdc();

            BitBlt(dc2, 0, 0, frm.ClientRectangle.Width, frm.ClientRectangle.Height, dc1, 0, 0, 13369376);

            g.ReleaseHdc(dc1);

            mg.ReleaseHdc(dc2);

            return formImage;

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)

    if (keyData == Keys.Control)

        MessageBox.Show("The A key was pressed");

        return true;

    return base.ProcessCmdKey(ref msg, keyData);

public Image byteArrayToImage(byte[] byteArrayIn)

    MemoryStream ms = new MemoryStream(byteArrayIn);

    Image returnImage = Image.FromStream(ms);

    return returnImage;

public byte[] imageToByteArray(System.Drawing.Image imageIn)

    MemoryStream ms = new MemoryStream();

    imageIn.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);

    return ms.ToArray();

public enum IconSize

    Small,

    Large

public class IconExtractor

    private const uint SHGFI_ICON = 0x100;

    private const uint SHGFI_LARGEICON = 0x0;

    private const uint SHGFI_SMALLICON = 0x1;

    [StructLayout(LayoutKind.Sequential)]

    private struct SHFILEINFO

        public IntPtr hIcon;

        public IntPtr iIcon;

        public uint dwAttributes;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]

        public string szDisplayName;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]

        public string szTypeName;

};

    [DllImport("shell32.dll")]

    private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);

    public IconExtractor()

    public System.Drawing.Icon Extract(string File, IconSize Size)

        IntPtr hIcon;

        SHFILEINFO shinfo = new SHFILEINFO();

        if (Size == IconSize.Large)

            hIcon = SHGetFileInfo(File, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_LARGEICON);

        else

            hIcon = SHGetFileInfo(File, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_SMALLICON);

        return System.Drawing.Icon.FromHandle(shinfo.hIcon);

    public System.Drawing.Icon Extract(string File)

        return this.Extract(File, IconSize.Small);

public List GetComputersOnNetwork()

    List list = new List();

    using (DirectoryEntry root = new DirectoryEntry("WinNT:"))

        foreach (DirectoryEntry computers in root.Children)

            foreach (DirectoryEntry computer in computers.Children)

                if ((computer.Name != "Schema"))

                    list.Add(computer.Name);

                    comboBox1.Items.Add(computer.Name );

    return list;