public void FromStart()

SelectionRange range = new SelectionRange( new SortDescription[] { new SortDescription( "ShipCountry", ListSortDirection.Ascending ) }, null, null );
 
// Select all items from the start to "C". All items that start with "A" or "B" will be selected. 
// Using "B" only would not work since, for example, "Belgium"  "B".
range.StartRangeInfos.FromStart();
range.EndRangeInfos.Add( "ShipCountry", "C" );
range.EndRangeInfos.IsInclusive = false;
 
this.listBox.SelectedRanges.Clear();
this.listBox.SelectedRanges.Add( range );