toValue method
Implementation
String toValue() {
  switch (this) {
    case SortOrder.ascending:
      return 'Ascending';
    case SortOrder.descending:
      return 'Descending';
  }
}String toValue() {
  switch (this) {
    case SortOrder.ascending:
      return 'Ascending';
    case SortOrder.descending:
      return 'Descending';
  }
}