title: Bind several classes into one .dll file in C#
body: <p>A beginner's question. It is c#.
  Let's say I have three classes in one project named Employee, Department, Address. For some reason, I would like to have a .dll file (let's name it test.dll) to have all three classes included that I can call it from some other project using syntax like "test.Employee emp1 = new test.Employee();"
  That is my idea. Is this possible? If yes, how should I do that? Do I have to create a class library project to do so? I know nothing about a class library project. So I may need further help with that. 
  If the answer is no, how do I add references to those classes from other solutions?
  Thanks.</p>