title: Convert a file Excel (that is not saved) to PDF in C#?
body: <p>In my project, I have libraries PDFCreator end Microsoft.Office.Interop.Excel.
  I would like save a file PDF, from a file Excel. I saw many examples but in each example I found, it is about <strong>Opening</strong> an existing file Excel then convert it to PDF.</p>
  
  <p>In my case, I create a file Excel <strong>without saving it</strong> (it is'nt supposed be saving) then I should save the created file Excel in PDF.</p>
  
  <p>How can I do it?</p>