title: how to use namespace of external project?
body: <p><strong>Currently :</strong></p>
  
  <p>I have the following Using in my program.</p>
  
  <pre><code>using Mtx;
  </code></pre>
  
  <p>which allows me to use Mtx.* properties. It refers to a file in "Externals" folder.</p>
  
  <p><em>Path is :</em>    <code>Externals/Mtx.dll</code></p>
  
  <p><strong>Needed :</strong></p>
  
  <p>However, for debugging purposes, I'd like to now have the whole mtx solution in external and use it.</p>
  
  <p><em>Path is :</em>    <code>Externals/Mtx/(solution in there with all folders)</code></p>
  
  <p>How can I do so, so instead of Using refers to the <code>Mtx.dll</code>, it now refers to the solution and build it has part of its own?</p>