Adding and removing items of databound listbox

I have a window forms application with two listboxes and 2 buttons. lbxAllItems, on the Right, is bound to a datatable (from a dataset from the database). When the user selects and item in lbxAllItems and clicks on btnAdd, I would like to remove that item from lbxAllItems and add it to lbxSelection. Conversely, when the user selects an item in lbxSelection and clicks on btnRemove, I would like to remove that item from lbxSelection and add it to lbxAllItems. This is what I've tried and its not working: private void btnAdd_Click(object sender, System.EventArgs e) { lbxSelection.Items.Add(((DataRowView)lbxAllItems.SelectedItem)["Items"]).ToString(); lbxAllItems.Items.Remove(((DataRowView)lbxAllItems.SelectedItem)["Items"]); } private void btnRemove_Click(object sender, System.EventArgs e) { lbxAllItems.Items.Add(lbxSelection.SelectedItem.ToString()); lbxSelection.Items.Remove(lbxSelection.SelectedItem.ToString()); } However, this is not working. When I clicking btnAdd, an item is added, but the item from the lbxAllItems is not removed. And when I click on btnRemove, the item IS removed from lbxSelection, but not added to the lbxAllItems. Is this an issue because lbxAllItems is bound? Thanks.