private List<User> GetUsers()
 {
     DocumentService service = new DocumentService();
     return service.GetUsers(String.Empty);
     //    return new List<User>(
     //new[] {
     //                new User { name = "John Doe", city = "Los Angeles" },
     //                new User { name = "Richard Louapre", city = "New York" }
     //            });
 }
 private void CreateUser(ref User user)
 {
     DocumentService service = new DocumentService();
     string id = service.CreateUser(user);
     user.Id = id;
 }