Felbook.Models.UserService.UnfollowUser C# (CSharp) Method

        public void UnfollowUser(User user, User follower)
        {
            if (!user.Followers.Contains(follower))
            {
                throw new UserException("User is not followed by " + user.FullName);
            }

            user.Followers.Remove(follower);
            db.SaveChanges();
        }