InfoPath 2007 Clear Databound Drop Down List with C#.Net

Over the past couple weeks I have been working with InfoPath 2007 and cascading drop down list. The issue is once a user decides to go out of the normal flow selection you need to clear the drop down list and re-bind the list. I couldn't find good examples on how to clear a list so I decided to share my code.

Call from your method:
ClearListBox("/my"myFields/my:listLocations/my:listLocationsItem", Root);

Here is the ClearListBox method:
public void ClearListBox(string xp_ListBox, XPathNavigator xNav)
{
//clear list box of items
XPathNodeIterator lstClear = xNav.Select(xp_ListBox, NamespaceManager);
if (lstClear.Count > 0)
{
for (int i = lstClear.Count; i > 0; i--)
{
XPathNavigator reList = MainDataSource.CreateNavigator();
XPathNavigator reListItems = reList.SelectSingleNode(xp_ListBox + "[" + i + "]", NamespaceManager);
reListItems.DeleteSelf();
}
}
}

I am using a Property for Root:
private XPathNavigator Root
{
get
{
return MainDataSource.CreateNavigator();
}
}