Pure POCO entity update problem in repository pattern

Question

I have a problem in my UserRepository in which I want to update a user. I dont want certain fields updated, such as password, unless specified. For example, When I pass the

Answer 1

Can you do this?

public User Save(User user)
    {
        if (user.UserId > 0)
        {
            User dbUser = context.Users.FirstOrDefault(u => u.UserId == user.UserId);
            //What do I do here?
            dbUser.Email = user.Email
            user = dbUser;
        }
        else
        {
            context.Users.AddObject(user);
        }
        context.SaveChanges();
        return user;
    }