Mouse wheel event usage

private void VideoView1_MouseEnter(object sender, EventArgs e) 
{ 
  if (!VideoView1.Focused) 
  { 
    VideoView1.Focus(); 
  } 
}

private void VideoView1_MouseLeave(object sender, EventArgs e) 
{ 
  if (VideoView1.Focused) 
  { 
    VideoView1.Parent.Focus(); 
  } 
}

private void VideoView1_MouseWheel(object sender, MouseEventArgs e) 
{ 
  mmLog.Text += "Delta: " + e.Delta + Environment.NewLine; 
}