title: C#: Folder not showing in current namespace
body: <p>I am creating a small application so that I can learn C#. I am using Visual Studio Code and .Net Core 3.</p>
  <p>When I started the project, the namespace was given as <code>SireEdu</code>. In the Solution explorer, I created a coupe of folders in which I placed some User Controls.</p>
  <p><a href="https://i.stack.imgur.com/SDweq.png" rel="nofollow noreferrer">The tree where the folders are located</a></p>
  <p>When referencing the content of those folders, I had no problem at all as you can see below here:</p>
  <p><a href="https://i.stack.imgur.com/KoBkk.png" rel="nofollow noreferrer">The folders appear in the namespace SireEdu</a></p>
  <p>I decided to add another folder in the same location called Security and try the same thing, but this time the folder does not appear in the namespace and it is throwing me an error:<code>The Type or namespace 'Security' does not exist in the namespace 'SireEdu.Usercontrols'</code></p>
  <p><a href="https://i.stack.imgur.com/7637R.png" rel="nofollow noreferrer">The new folder</a></p>
  <p>I don't understand this error since I am doing exactly the same thing as I did before.</p>
  <p>This might look trivial but for me as beginner, I am having a hard time finding a solution.</p>