C#

float sx = 1.0F;
float sy = 1.0F;
Font font = new Font("Verdana", 10.0F);
private void panel1_Paint(object sender, PaintEventArgs e)
    {
    Graphics g = e.Graphics;
    g.ScaleTransform(sx, sy);
    g.DrawRectangle(Pens.Blue, new Rectangle(50,50,150, 150));
    g.DrawLine(Pens.Red, 0,0, 200,200);
    g.DrawString("Hello there this is text", font, Brushes.Green, new Point(20,20));
    }

private void butZoomIn_Click(object sender, EventArgs e)
    {
    sx *= 2;
    sy *= 2;
    panel1.Invalidate();
    }

private void butZoomOut_Click(object sender, EventArgs e)
    {
    sx /= 2;
    sy /= 2;
    panel1.Invalidate();
    }

Vuyiswa Maseko wrote:

its not like i posted the same question in the same website.

Roger Wright wrote:

The ? operator can be used with any type, for what it's worth.

bool customerLikedProduct;
bool customerResponded;

enum NullableBool { True, False, Maybe }

bool? customerLikedProduct;