Below I have my code which takes two input text fields and
puts the sum into the total. The problem I'm having is the way the
code is below the submit_btn only works the equation once. If I
change the values Im entering in the a1_txt or a2_txt then hit
submit_btn again, nothing happens; it keeps the prior total. If you
use the commented statement all works fine - why is this?
Side question: is there a way to hold or save the users
values they enter in a1_txt or a2_txt into an XML file? then reload
them when they log back in?