title: PDF Merging by ItextSharp
body: <p>How would I merge several pdf pages into one with <code>iTextSharp</code> which also supports merging pages having <strong><em>form</em></strong> elements like <code>textboxes</code>, <code>checkboxes</code>, etc.</p>
  
  <p>I have tried so many by googling, but nothing has worked well.</p>