title: How do I reference a namespace in another .cs file?
body: <p>So I'm for one of my own .cs files, I'm trying to use the TestPDF Namespace from the last post here:</p>
  
  <p><a href="http://forums.asp.net/t/1886131.aspx?Convert+HTML+to+PDF+using+iTextSharp" rel="nofollow">http://forums.asp.net/t/1886131.aspx?Convert+HTML+to+PDF+using+iTextSharp</a></p>
  
  <p>which is contained within HTMLToPDFBuilder.cs. So for my someFile.cs I try to use the TestPDF namespace with <code>using TestPDF;</code> However, it says </p>
  
  <blockquote>
    <p>The type/namespace could not be found [...]</p>
  </blockquote>
  
  <p>How do I add a directive/assembly reference to this namespace within the file? I'm using VS2013 and tried right clicking my project stub in the solution and did Add>Reference, but it only takes .dll-esque file extensions, not .cs ones.</p>