public void SortDescending()

var tv = TableView.Active;
if (tv == null)
  return;

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


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


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


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