public void MoveItemBetweenList(string listToList) { if (listToList == "1to2") { // Move selected item from list 1 to list 2 AListItemViewModel selectedItem = ListOne.SelectedItem; ListOne.RemoveFromList(selectedItem); ListTwo.AddToList(selectedItem); } if (listToList == "2to1") { // Move selected item from list 2 to list 1 AListItemViewModel selectedItem = ListTwo.SelectedItem; ListTwo.RemoveFromList(selectedItem); ListOne.AddToList(selectedItem); } }