Free hand drawing on an image and then saving the image

[Cory_Brown]

I found this nifty piece of code online that lets me draw on a form.

protected override void OnMouseMove(MouseEventArgs e)
        {
            g = CreateGraphics();
            g.SmoothingMode = SmoothingMode.AntiAlias;
            p = new Pen(Color.Black);
            if (lastPoint.Equals(Point.Empty)) lastPoint = new Point(e.X, e.Y);
            if (mouseDown)
            {                Point pMousePos = new Point(e.X, e.Y);
                g.DrawLine(p, pMousePos, lastPoint);
            }
            lastPoint = new Point(e.X, e.Y);
        }

This lets me easily draw on the form by clicking the left mouse buttong and dragging it around. Similar to what you see when using a pencil tool in paint. I'm curious how I would load an image, draw on it and then save it.

I found this piece of code to load and image but haven't been able to get it to work with the above code.

Bitmap myBitmap = new Bitmap(@"C:\Documents and 
   Settings\Joe\Pics\myPic.bmp");
Graphics g = Graphics.FromImage(myBitmap);

Any nudge in the right direction would be a great help.

Thanks in advance.