public void SortDescending()

{
  // sort the active field descending
  if (tableView.CanSortDescending)
    tableView.SortDescending();

  // sort the active field ascending
  if (tableView.CanSortAscending)
    tableView.SortAscending();

  // perform a custom sort programmatically
  if (tableView.CanCustomSort)
  {
    // sort fields
    Dictionary<string, FieldSortInfo> dict = new()
    {
      { "STATE_NAME", FieldSortInfo.Asc },
      { "CITY_NAME", FieldSortInfo.Desc }
    };
    tableView.SortAsync(dict);
  }

  // perform a custom sort via the UI
  if (tableView.CanCustomSort)
    tableView.CustomSort();
}