Because you can select multiple items in a DBListBox,so you must use the Items property to access the values of a DBListBox.
Like this: DBListBox.Items(DBListBox.ItemIndex) is current selected item.
another like this:
for i:=0 to DBListBox.Items.Count-1 do
if DBListBox.Selected[i] then //if you selected i items,the condition value is True.
......