How to use Mouse_Wheel to zoom in & out

Question

How to use Mouse_Wheel to zoom in & out pictureBox ...

i use this code :

namespace Test_Code_Csharp 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
            pictureBox1.MouseWheel += new MouseEventHandler(pictureBox1_MouseWheel); 
        } 

        void pictureBox1_MouseWheel(object sender, MouseEventArgs e) 
        { 
            pictureBox1.Height += e.Delta / 60; 
            pictureBox1.Width += e.Delta / 60; 
            pictureBox1.Top -= e.Delta / 120; 
            pictureBox1.Left -= e.Delta / 120; 
        }

But no happen ! no error ! and no ...