title: How can I hide fields in an AcroForm?
body: <p>I am trying to execute following code to hide a field</p>
  
  <pre><code>    fields.SetFieldProperty("numberOfPages","setfflags", PdfAnnotation.FLAGS_INVISIBLE, null );
   or 
      fields.SetFieldProperty("slash", "setfflags", PdfAnnotation.FLAGS_HIDDEN, null);
  </code></pre>
  
  <p>I got the code from the Itext in Action book. I am  using Itextsharp 4.1.6 but get no result, no error thrown. What am I dıoing wrong? btw "setfflags" is from the book.</p>