title: How to check if a checkbox is checked or not on a non-form PDF using C#?
body: <p>Using c#, I want to see if a specific check box is checkd on a PDF page. The PDF file is <strong>not</strong> a form one.</p>
  
  <p>PDF could be something like: <img src="https://i.stack.imgur.com/HuYw4.jpg" alt="enter image description here"></p>
  
  <p>Sample file is here: <a href="http://1drv.ms/V4GrIu" rel="nofollow noreferrer">MDS30ResidentP2.pdf</a> 
  (in this sample file, I want to somehow figure it out that check-box "E" in the question A1000 is checked. Again: the PDF is not in "form" format!).</p>
  
  <p>PS: none of the following posts was solved my problem:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/q/21285072/538387">PDF Parsing extract CheckBox Fields value</a></li>
  <li><a href="https://stackoverflow.com/q/8314296/538387">iTextSharp: reading radio button, check box states from a non-form PDF</a></li>
  </ul>