title: Highlighting text ( colors ) of existing PDF using iTextsharp using C#
body: <p>I would like know whether we can highlight text (colors) of already created <code>PDF</code> using <code>itextsharp</code>?</p>
  
  <p>I see examples like creating a new PDF, while doing so we can apply colors. I am looking for where I can get chunks of text from PDF and apply colors and save it.</p>
  
  <p>Here is the thing I am trying to accomplish, read a PDF file, parse text and highlight text based on business rules.</p>
  
  <p>Any third party dll suggestion also works, as a first step I am looking in to <code>opensource iTextsharp library</code>.</p>