public int SetCategory(Category category) { _logger.Info($"BLL.{nameof(CategoryBll)}.{nameof(SetCategory)}: Retention of the category"); if (category.Id != null) { int id = _categoryDao.ChangeCategory(category); _logger.Info($"BLL.{nameof(CategoryBll)}.{nameof(SetCategory)}: Category id = {id} changed"); return(id); } else { int id = _categoryDao.AddCategory(category); _logger.Info($"BLL.{nameof(CategoryBll)}.{nameof(SetCategory)}: Category id = {id} added"); return(id); } }