InfoPath Dev

How would I go about populating a drop down list using vb.net code. Is there anything special I would need to do in order to access and add new values in the drop down list.

You will need to set the dropdown to populate from a repeating group in either the main or a secondary source.  Then you can use code to manipulate the XML items in that repeating group.

OK for the first drop down list, the code runs perfectly when the form loads. from the selection of this drop down list I want to populate the next drop down list. So all I did was copy and paste the exact same code into the changed event. I have attached my code the 5th line of code "nav.SelectSingleNode("/my:myFields/my:SectionA/my:names", NamespaceManager).SetValue("")" gives me the following error: Operation is not valid, because of the current state of the object. Any Idea what is wrong?

Are you sure you put that in the Changed event, and not the Changing event?  I would expect trying to modify the data source during a Changing event to produce an error like that.

thanks, it was a changing event rather than a changed event

Ok next problem with the same dropdownlists... when a user makes a selection in the drop down list, it populates the next drop down list... OK that all works correctly now... the problem comes in when a user goes back to the original drop down list and selects something else, I need the repeating group to drop all of its values and load a new set, because the previous values still come up... I tried to delete the values, but i just ended up with an object null exception.... Any Ideas?

What does the delete code look like?

here it is...

That looks like it should work, except that it will cause a NullReferenceException if there are no items in the list yet.  Try using an If statement to skip the rest of the subroutine if group2NodesCount is 0.

Not sure what I'm doing wrong... Here is how I edited the code to skip the rest of the subroutine if group2NodesCount is 0