webservices and objects ???

I was hoping to write a webservice that I pass a username and a password via an object then it would return me that object with a number of properties. When I test the webservice it works fine however when I go to use the webservice and object in a program I have two classes to choose from one allows me to use the method this is the webservise one then the other one is the one I wrote to hold properties and that only shows my properties and not any of the methods in this class does anyone have any experience with this it seems to me that this should be fairly easy to do or Im trying something that isnt do able.