C#

   listBox1.MouseWheel += new MouseEventHandler(listBox1_MouseWheel);

...

void listBox1_MouseWheel(object sender, MouseEventArgs e)
{
     // Execute x command here...

    // Mark event as handled so no scrolling happens
    (e as HandledMouseEventArgs).Handled = true;
}

Mark Salsbery
Microsoft MVP - Visual C++

MapRender.MouseWheel += MapRender_MouseWheel;
...
      void MapRender_MouseWheel(object sender, MouseEventArgs e)
        {
            if (e.Delta > 0)
                _presenter.IncreaseTileSize();
            else _presenter.DecreaseTileSize();
            (e as HandledMouseEventArgs).Handled = true;
        }

Philippe Mori wrote:

The best thing to do would be to uses a modifier key (like Shift + Mouse wheel) for your action.

            MapRender.MouseWheel += MapRender_MouseWheel;
            MapRender.KeyDown += MapRender_KeyDown;
            MapRender.KeyUp += MapRender_KeyUp;
...
 void MapRender_KeyUp(object sender, KeyEventArgs e)
        {
            if(_current == e.KeyCode)
            {
                _current = Keys.None;
            }
        }

        private Keys _current = Keys.None;
        void MapRender_KeyDown(object sender, KeyEventArgs e)
        {
            _current = e.KeyCode;
        }

        void MapRender_MouseWheel(object sender, MouseEventArgs e)
        {
            if(_current != Keys.ControlKey) return;
            if (e.Delta > 0)
                _presenter.IncreaseTileSize();
            else _presenter.DecreaseTileSize();
        
        }

void MapRender_MouseEnter(object sender, EventArgs e)
{
    this.ActiveControl = null;
}