title: When to build\use Multiple Projects within a Solution
body: <p>i am a good but not so advanced .NET Developer. This is more of a Expert to juniors knowledge transfer request.</p>
  
  <p>I was thinking, in Visual Studio you can <code>Add</code> projects inside a solution. Of-course these projects will carry different namespace. </p>
  
  <p>My question is </p>
  
  <ul>
  <li>Why to build a project inside a solution</li>
  <li>When it is good\useful to build multiple project inside a solution. </li>
  </ul>