InfoPath Dev

I would like to add a button that will refresh/reload the secondary data connection for a list box, but havn't been able to get the code right. I tried

XDocument.DataObjects["Program_Name"].ForceUpdate();

but I am getting an error that XDocument.DataObjects.Program_Name is null or not an object.  Not sure if I am close or way off the mark.  Any help would be appreciated.  I am using Infopath 2003.

 Thanks in advance.

Check the developers reference on MSDN for the proper syntax.

I believe it is query() just like in the UI.

 Thanks Clay,

That along with a XDocument.View.ForceUpdate(); did the trick!