class ScreenShot
     {
     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);
             }
         }
     }