title: Exporting data to Excel, Docs and PDF (Dotnet Core 2.x)
body: <p>I have ongoing project that need to export data into excel, docs and pdf.
  We need to import it into predefined file (such have header and footer on each page).</p>
  
  <p>Also for the (Ms) Docs, I need to be able to open docs and mail merge into the docs, and also could convert to pdf afterthat.</p>
  
  <p>I found some people recommend between using NPOI and OpenXML for this one. But I am overwhelmed with the information on the internet. Which one between NPOI or OpenXML that suits for this job ? I am open to other library as well.
  I prefer to use one that easier to use.</p>
  
  <p>Our project is using Dotnet Core 2.1x and Angular 6 at the moment.</p>