The many approaches to Entity Framework(blog.jonathanchannon.com)

   class UserService {
       // ... DI crud here.
       public BooleanResult AddUser(UserTransferObject userTransferObject) {
           // Validate shit here

           // Create shit
           using (var session = sessionFactory.OpenSession()) // UOW boundary
           using (var trans = session.BeginTransaction()) // Transaction boundary
           {
               var user = User.CreateFromTransferObject(userTransferObject);
               session.Add(user);
               trans.Commit();
               return BooleanResult.Success();
           }
       }
   }