after days of research, I am still going to you to help me. I would like to add ranking numbers to a listbox for each item like this:

1 antoine
2 bob
3 peter
4 franck
5 lisa

i don't know to manipulate the column with listbox. It is very important that there is a separation between the number of ranking and the items already classified . or have a code like this:
column 1(*ranking) column 2 (*from a another listbox already order)
1 | antoine
2 | bob
3 | peter
4 | frank
5 | lisa

the numbers(column 1) must match with numbers of items in lisbox (column2) (if possible)
in resume, i need the number ranking please.
thank you in advance for your answer!