This demo illustrates how all items, or only selected items, can be moved from one DevExpress ASP.NET List Box (ASPxListBox) to another on the client side in response to button clicks.
Selected items are obtained using an editor's client GetSelectedItems method. Items are moved by removing them from the Items collection of one editor (via the client RemoveItem method), and adding them to another editor (via the client AddItem method).
Note that the client BeginUpdate and EndUpdate methods are used by both editors to encapsulate the code that moves items. This is required to avoid repetitive operations (such as editor size correction) until all items are moved.
The EnableSynchronization property set to true enables you to pass the items collection's changes to the server side. This also allows keeping the client changes between postbacks.