title: itextsharp trimming pdf document's pages
body: <p>I have a pdf document that has form fields that I'm filling out programatically with c#.  Depending on three conditions, I need to trim (delete) some of the pages from that document.</p>
  
  <p>Is that possible to do?</p>
  
  <p>for condition 1: I need to keep pages 1-4 but delete pages 5 and 6</p>
  
  <p>for condition 2: I need to keep pages 1-4 but delete 5 and keep 6</p>
  
  <p>for condition 3: I need to keep pages 1-5 but delete 6</p>