void PaintCurrentByteSign(Graphics g, Rectangle rec)
{
// stack overflowexception on big files - workaround
if (rec.Top < 0 || rec.Left < 0 || rec.Width <= 0 || rec.Height <= 0)
return;
Bitmap myBitmap = new Bitmap(rec.Width, rec.Height);
Graphics bitmapGraphics = Graphics.FromImage(myBitmap);
SolidBrush greenBrush = new SolidBrush(_shadowSelectionColor);
bitmapGraphics.FillRectangle(greenBrush, 0,
0, rec.Width, rec.Height);
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.GammaCorrected;
g.DrawImage(myBitmap, rec.Left, rec.Top);
}