title: InStr(1, cell.Value, "-") doesn't seem to be working with Not
body: <p>I have a conditional that doesn't seem to work.</p>
  
  <pre><code>If Not InStr(1, cell.Value, "-") Then
      'Do Something
  Else
      'Do something else
  End If
  </code></pre>
  
  <p>Where <code>cell.Value</code> are either numbers in a spreadsheet with a dash: "6621-123", or without a dash: "555321"</p>
  
  <p>The first <code>If</code> let's both through and the <code>Else</code> is ignored. Any ideas why this isn't working?</p>