Реализация метода:
public static void CaptureImage(Point SourcePoint, Point DestinationPoint,
Rectangle SelectionRectangle, string FilePath)
{
using (Bitmap bitmap = new Bitmap(SelectionRectangle.Width,
SelectionRectangle.Height))
{
using (Graphics g = Graphics.FromImage(bitmap))
{
g.CopyFromScreen(SourcePoint, DestinationPoint,
SelectionRectangle.Size);
}
bitmap.Save(FilePath, ImageFormat.Bmp);
}
}
}
Последующий вызов:
Point StartPoint = new Point(ClickPoint.X, ClickPoint.Y);
Rectangle bounds = new Rectangle(ClickPoint.X, ClickPoint.Y,
CurrentPoint.X - ClickPoint.X, CurrentPoint.Y - ClickPoint.Y);
ScreenShot.CaptureImage(StartPoint, Point.Empty, bounds, ScreenPath);
Кредит первоначальному автору @ http://www.codeproject.com/KB/cs/TeboScreen.aspx