title: Convert a completed project to a DLL
body: <p>How can I convert a completed C# project to a DLL, in order to use it in other projects?</p>
  
  <p>I have Googled but lots of results say to open the Class Library, write your code there, then Build Solution and everything will be ok.</p>
  
  <p>But my question is: how can I convert a completed project to a DLL? The project can include lots of Forms etc.</p>