title: How to set the visibility of a rectangle in SSRS
body: <p>I'm having some difficulty implementing the visibility of a rectangle and I used this line of code to set the visibility: </p>
  
  <pre><code>=IIF(Len(ReportItems!txtCountVolunteer.Value) &gt; 0, true, false) 
  </code></pre>
  
  <p>Unfortunately it doesn't work.</p>