title: Label linked to a text box value
body: <p>Good morning,
  I am editing an User Form on VBA Excel and I would like to show an alert if the user insert a certain value in a text box.
  I wrote this code:</p>
  
  <pre><code>If txtbox.Value &lt; 0 Then
  lbl_Alert.Visible= True
  Else
  lbl_alert.Visible=False
  End IF
  </code></pre>
  
  <p>The code works properly but once the alert appears if I change the value in the text box it doesn't disappear.
  What string should I add to my script to let the label disappear when I change the text box value?</p>
  
  <p>Thank you!</p>