procedure TForm1.Button1Click(Sender: TObject); var sl: TStringList; begin sl := TStringList.Create; try
with sl do
begin // Duplicates does nothing
// if the list is not sorted. Sorted := True; // Ignore attempts to add
// duplicate strings to the list. Duplicates := dupIgnore;
Add(Edit1.Text); end;
Listbox1.Items.Assign(sl); finally sl.Free; end; end;