Splitting rows in a listbox

Hi Everyone,
       I am working with the listbox and binding the data to the listbox. My question is if i retrieve 20 rows in a listbox then how can i arrange 10 rows on each column (splitting 10 rows side by side or dividing). If so, can you please explain with the solution.
sample:
Exact Data in a Listbox                                      Looking for something like this:
Listboxitem1                                                       Listboxitem1  ...