title: WinForms: How to prevent textbox from handling alt key and losing focus?
body: <p>I have this textbox I use to capture keyboard shortcuts for a preferences config. I use a low-level keyboard hook to capture keys and also prevent them from taking action, e.g. the Windows key, but the Alt key still comes through and makes my textbox lose focus.</p>
  
  <p>How can I block the Alt key, so the focus is kept unaltered at my textbox?</p>