private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            if (paint)
            {
                if (rect != null)
                {
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleFirstDigit());
                }

                if (rect2 != null)
                {
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                    e.Graphics.DrawRectangle(Pens.Blue, GetRectangleOtherDigits());
                }
            }
        }

private Rectangle GetRectangleFirstDigit()
        {
            rect = new Rectangle();
            rect.X = Math.Min(StartLocation.X, EndLcation.X);
            x = rect.X;
            rect.Y = Math.Min(StartLocation.Y, EndLcation.Y);
            y = rect.Y;
            rect.Width = Math.Abs(StartLocation.X - EndLcation.X);
            w = rect.Width;
            rect.Height = Math.Abs(StartLocation.Y - EndLcation.Y);
            h = rect.Height;

            //MessageBox.Show("Coordinate rettangolo: \n\n X : " + x + "\n Y : " + y + "\n W : " + w + "\n H : " + h);
            rectangles.Add(rect);
            return rect;
        }

private Rectangle GetRectangleOtherDigits()
        {
            rect2 = new Rectangle();
            x -= w;
            rect2.X = x;
            rect2.Y = y;
            rect2.Width = w;
            rect2.Height = h;
            rectangles.Add(rect2);
            return rect2;
        }