title: Access 2007 vba null
body: <p>My program doesn't process past this statement:</p>
  
  <pre><code>Dim valid as Boolean
  If MyComboBox.Value Is Not Null Then valid = true
  </code></pre>
  
  <p>Why not? </p>
  
  <p>If I try to step through using stop points the program does not proceed to the next step, but the form keeps running as if no vba code is being run. This is annoying because it means the form can still be used as if nothing is wrong but the intended behavior is not occuring.</p>