title: SQL Reporting Services Expression to evaluate if field is null &| white space
body: <p>I'm making a report and in a text box I want to show the Tax ID of a entity if one exists. However if a tax ID doesn't exist then that field is just white space. So if the field is white space I want to show nothing in the text box.</p>
  
  <pre><code>IIF(IsNothing(Fields!TAX_ID.Value), "", "Tax ID: " &amp; vbCrLf &amp; Fields!TAX_ID.Value)
  </code></pre>
  
  <p>What do I do?</p>