title: Debugging .NET assemblies built outside of Dev Studio
body: <p>I have a .NET project which references another assembly that is built outside of the solution.</p>
  
  <p>I have all of the source code to the other assembly - but I can only add it as a ".DLL" reference rather than adding the actual project as a dependency.</p>
  
  <p>The problem is that when I step into the external code, the debugger "steps over" it.</p>
  
  <p>How do I enable "source code" debugging for the external .NET assembly.</p>