Связанные таблицы

var Users = await db.AppDataUsers.Include(user => user.AppUser)

                    .Select(user => new

                         {

                        Name = user.Name,

                        Surname = user.Surname,

                        MiddleName = user.MiddleName,

                        Authorized = user.AppUser.Authorized,

                       })

                    .ToListAsync();

            return Json(Users);

 var Users = await db.AppDataUsers.Include(user => user.AppUser)

                    .Select(user => new UserList

                    {

                        Authorized = user.AppUser.Authorized,

                    })

                    .ToListAsync();