// Creates a bitmap for copying.

private Bitmap CreateBitmap(int sideSize)

{

    Bitmap bmp = new Bitmap(sideSize, sideSize);

    Graphics g = Graphics.FromImage(bmp);

    g.FillEllipse(new SolidBrush(Color.Red), 0, 0, sideSize, sideSize);

    g.DrawLine(new Pen(Color.Black), 0, 0, sideSize, sideSize);

    g.DrawLine(new Pen(Color.Black), sideSize, 0, 0, sideSize);

    g.Dispose();

    return bmp;

}

// Copies the entire bitmap.

protected Bitmap CopyBitmap(Bitmap source)

{

    return new Bitmap(source);

}

// Copies a part of a bitmap.

protected Bitmap CopyBitmap(Bitmap source, Rectangle part)

{

    Bitmap bmp = new Bitmap(part.Width, part.Height);

    Graphics g = Graphics.FromImage(bmp);

    g.DrawImage(source,0,0,part,GraphicsUnit.Pixel);

    g.Dispose();

    return bmp;

}

// Draws the bitmaps on the form.

protected override void OnPaint(PaintEventArgs e)

{

    Font arialFont;

    Brush blackBrush;

    arialFont = new Font("Arial", 10, FontStyle.Regular);

    blackBrush = new SolidBrush(Color.Black);

    // Set the size of the sides of the bitmap,

    // and get one-third of it for the center bitmap.

    int sidesize = 75;

    int third = (int) sidesize/3;

    // Create bitmap.

    source = CreateBitmap(sidesize);

    // Copy entirely as a clone.

    clone = CopyBitmap(source);

    // Copy the center part of the bitmap.

    center = CopyBitmap(source, new Rectangle(third, third, third, third));

    // Save the bitmap to a file.

    clone.Save("newbitmap.bmp", ImageFormat.Bmp);

    // Draw the source, clone, and partial

    // bitmaps vertically down the screen.

    int y = 10;

    e.Graphics.DrawString("source bitmap:", arialFont, blackBrush, 10, y);

    y += 20;

    e.Graphics.DrawImage(source, 10, y);

    y += source.Height + 10;

    e.Graphics.DrawString("clone bitmap:", arialFont, blackBrush, 10, y);

    y += 20;

    e.Graphics.DrawImage(clone, 10, y);

    y += clone.Height + 10;

    e.Graphics.DrawString("center part of bitmap:", arialFont, blackBrush, 10, y);

    y += 20;

    e.Graphics.DrawImage(center, 10, y);

    y += center.Height + 10;

    // Dispose graphic objects.

    arialFont.Dispose();

    blackBrush.Dispose();

}