public async Task<IHttpActionResult> PutArticle(int id, Article article)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != article.Id)
            {
                return BadRequest();
            }

            _uow.ArticleRepository.Insert(article);

            try
            {
                await _uow.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (_uow.ArticleRepository.GetById(id) == null)
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.Created);
        }
        public async Task<IHttpActionResult> PostArticle(Article article)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            _uow.ArticleRepository.Insert(article);
            await _uow.SaveChangesAsync();

            return CreatedAtRoute("GetArticleById", new { id = article.Id }, article);
        }