Listbox And Listview items adddition
 

can u pass an idea... is this is possible to plus all that items(Integer) that are in listbox or listview... e.g a list box have 4 items... 1)-20 2)-40 3)-80 4)-100 is this possible to plus these items,??? items also can b infinite, depends upon user...i dont have any idea, and could not find...