title: How to map two entity to one with automapper?
body: <p>I have three entity.</p>
  
  <pre><code>public class Book
  {
      public string Name {get;set;}
  }
  public class Author
  {
      public string AuthorName {get;set;}
  }
  
  public class BookDTO
  {
      public string Name {get;set;}
      public string AuthorName {get;set;}
  }
  </code></pre>
  
  <p>how to map <code>Book</code> and <code>Author</code> to <code>BookDTO</code> ?
  and how to map <code>BookDTO</code> to <code>Book</code> and <code>Author</code>?
  I used the automapper in my solution.</p>