i'm having trouble passing parameters back to a report exposed as a web service:

i'm using a report viewer control embedded in a winform
the report source is set at run time to a web service proxy object

a) i create parameterfield and value objects client side , add them]
to the parameter array of the viewer control, the reoprt opens and still asks for parameters ,. after adding them manually
b) a login box pops up

ideally, i want to send parameters without this box popping up,
and also configure the logon details etc of the report at runtime
, -- but using the web service


is this possible?