title: The name doesn't exist in the current context - How to resolve?
body: <p>When I try to access a class that is not in the current namespace while I also added <code>using</code> for that class namespace but still receive an error.</p>
  
  <p>There is an error that says:</p>
  
  <blockquote>
    <p>The name 'AddNewDataFile' doesn't exist in the current context.</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/hC02Y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hC02Y.png" alt="enter image description here"></a></p>
  
  <p>How can I resolve this error?</p>