private void RefreshSelection()
{
Rectangle rect = SelectionRectangle;
if (_selectRect != rect)
{
_selectRect = rect;
using (Graphics g = Graphics.FromImage(Image))
{
g.Clear(Color.White);
g.DrawImageUnscaled(_srcImage, 0, 0);
g.DrawRectangle(_outterPen, rect);
g.DrawRectangle(_innerPen, rect);
}
Invalidate();
}
}