c# - MouseWheel event issues on Controls -


I need to get mousewheel events on picturebox control and according to another answer, Should: 

  zero pic_MouseWheel (object sender, MouseEventArgs e) {if (e.Delta! = 0) {MessageBox.Show (e.Delta.ToString ()); }}   
 But this does not work Now the message box is displayed and no breakpoint is being hit.  
 How can I capture a mousewatch event on a picture box and can also determine how the user scrolls down the UP or down wheel?   
 
 
 No problem, I thought it. I need to first focus the image box:  
  zero pic_Click (object sender, EventArgs e) {(PictureBox Sender) Focus (); }

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