title: where should inheritance classes be stored?
body: <p>I want to create classes that can be inherited by other classes to use along my project.
  i.e. i want to create a separate class for each Mail method, each class will implement differently the Compose method, and more Mail classes will be created in the future.</p>
  
  <p>My question is - Where should I create these classes/interfaces? in the App_Code ?</p>