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Код

private void source_MouseMove(object sender, MouseEventArgs e)
        {            
       /*     filtered_g.Clear(Color.White);
            filtered_g.DrawImage(source.Image, new Rectangle(0, 0, 180, 180), new Rectangle((int)(((e.X - add_width) * work_coeff) - (180/2) / scale_factor), (int)(((e.Y - add_height) * work_coeff) - (180/2) / scale_factor), (int)(180 / scale_factor),(int)( 180 / scale_factor)), GraphicsUnit.Pixel);
            filtered_g.DrawLine(new Pen(Brushes.Black, 2), 90, 80, 90, 100);
            filtered_g.DrawLine(new Pen(Brushes.Black, 2), 80, 90, 100, 90);*/ - попытка сделать ручной magnifier
            if (selection) {
                if (delete_selection == false)
                {
                    ControlPaint.DrawReversibleFrame(Select, this.BackColor, FrameStyle.Dashed);                    
                }
                Point endPoint = ((Control)sender).PointToScreen(new Point(e.X, e.Y));
                int width = endPoint.X - Start.X;
                int height = endPoint.Y - Start.Y;
                Select = new Rectangle(Start.X, Start.Y, width, height);
                ControlPaint.DrawReversibleFrame(Select, this.BackColor, FrameStyle.Dashed);
                delete_selection = false;            
            }
        }

        private void source_MouseDown(object sender, MouseEventArgs e)
        {                             
                selection = true;
                Control control = sender as Control;
                Start = control.PointToScreen(new Point(e.X, e.Y));                            
        }

        private void source_MouseUp(object sender, MouseEventArgs e)
        {
            if (selection == true)
                selection = false;                            
        }