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I want to use the code below, but the "MouseWheel" event is not working.

private void zoomControl1_MouseWheel(object sender, MouseEventArgs e)
    {
      
       if (Control.ModifierKeys == Keys.Control && e.Delta > 0)
       {
          zoomControl1.Zoom += 0.1f;
       }
       else if (Control.ModifierKeys == Keys.Control && e.Delta < 0)
       {
          zoomControl1.Zoom -= 0.1f;
       }
    }
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  • Did you register the event (manually or in the designer) ? If not you need something like: ...MouseWheel += zoomControl1_MouseWheel ... Commented Dec 21, 2022 at 13:53
  • 1
    What is ZoomControl? Commented Dec 21, 2022 at 14:24
  • Legacy Windows versions used to raise MouseWheel on the control that has the focus. That changed in Win10, it has a new option named "Scroll inactive windows when I hover over them" and is turned on by default. Which is probably what you wanted, you may have to pinvoke SendMessage() to pass the WM_MOUSEWHEEL message to that 'zoom control' on old versions. Commented Dec 21, 2022 at 15:16
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