public async Task <int> AddAsync(News news)
        {
            await context.News.AddAsync(news);

            await context.SaveChangesAsync();

            return(news.Id);
        }
        public async Task <User> Register(User user, string password)
        {
            byte[] passwordHash, passwordSalt;
            CreatePasswordHash(password, out passwordHash, out passwordSalt);

            user.PasswordHash = passwordHash;
            user.PasswordSalt = passwordSalt;

            await context.Users.AddAsync(user);

            await context.SaveChangesAsync();

            return(user);
        }