Hmm not sure about VFP recognizable, it looks quite X# to me... :-P
Well, in VFP I would have done:
use customers in 0 shared
I wouldn't need to specify the CDX as it would be opened automatically.
I could also do, in VFP:
if seek("ADA0001", "customers", "account") endif
or in fact:
update customers where account = "ADA0001" set creditlim = 1000
PS: By the way, are you using Visual Studio or XIDE for this work?
Visual Studio, as I am very familiar with it already.