title: You must add a reference to assembly 'WindowsBase, Version=3.0.0.0
body: <p>I'm currently writing up an upload system that takes XML from the document and will display it on a web page.</p>
  
  <p>The issue I'm facing, is that whenever I'm adding the XML extraction part of the website, the compiler will return the error as mentioned in the title. I have already added WindowsBase, both from manually and from the drop down menu. </p>