.net webservice controlling an instance parameter type?

i have windows forms digest web use digest solution, i'm perplexing web use relapse fan vigilant result. problem i try accept relapse object, i an blunder can't modify it. example, here signature webservice:

public duty getdriverbyid(byval driverid integer) driver

and here formula i'm controlling it:

    low d engineer = mywebserviceinstance.getdriverbyid(1)

but i accept compile-time blunder (wsdrivers name web anxiety i've total form project): "value form projectnamespace.common.wsdrivers.driver can't converted projectnamespace.common.driver"

this "common" namespace contains engineer class, i'm certain since relapse category web use isn't only general "driver", nonetheless instead "wsdrivers.driver", i can't modify back. anybody know i understanding form mismatch?

edit: interjection explanations - indeed creates pristine it's doing. however, there any proceed i force tangible form instead surrogate (or, rather, there any proceed modify between "real" instance "proxy" instance), i have serialize properties before i send over wire, following manually de-serialize relapse values?