public ProductCategoriesManagementDataAccessService(NorthwindDataAccessFactory factory)
 {
     this.factory = factory ?? throw new ArgumentNullException(nameof(factory));
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="ProductCategoriesManagementDataAccessService"/> class.
 /// </summary>
 /// <param name="sqlConnection">Sql connection.</param>
 public ProductCategoriesManagementDataAccessService(SqlConnection sqlConnection)
 {
     this.northwindDataAccessFactory = new SqlServerDataAccessFactory(sqlConnection) ?? throw new ArgumentNullException(nameof(sqlConnection));
 }