one of the listbox data is transfer to another listbox

Question

hi!
i take Two list boxes. and two buttons one for Add Items and another for Remove Items.
by default items is displayed in Listbox1 and i select items (one or more) and click Add items button that selected items are added into the Listbox2 . And i select items into the Listbox2, and i click Remove Items button That selected items are Removed from Listbox2.
Please Give a code for this
Thanks.