public CommentsService()
        {
            var data = new SimpleBlogSystemDbContext();

            this.posts = new EfGenericRepository<Post>(data);
            this.comments = new EfGenericRepository<Comment>(data);
            this.users = new EfGenericRepository<User>(data);
        }
        public PostsService()
        {
            var data = new SimpleBlogSystemDbContext();

            this.posts = new EfGenericRepository<Post>(data);
            this.categories = new EfGenericRepository<Category>(data);
            this.users = new EfGenericRepository<User>(data);
        }