Ruhe and XmlChangedEvent, Which one will be executed first?

[time is life]

hi, all:

in Infopath browser-enabled form,

I added a rule to a drop down list and let it query data using a data
connection.
then I use the query result in the XmlChangedEvent in the managed codes.
when I changed the selection of the drop down list, a dialog which
said:"Sending data to the

server" appeared and keep appearring.
why does this happen?
When I add both a Rule and a XmlChangedEvent to a drop down list, which one
will be executed

firstly?

Your kindly reply will be appreciated.

thanks.

 

[Clay Fox]

Rules are always processed before code.
In a browser form though you have post back and other issues that may make
this more complicated.