I am getting started on experimenting with SalesForce.com integration, and imported the Partner WSDL to start playing with it.  When I add a Service reference to the partner.wsdl (Partner Web Services API Version 20.0) I get a dll that contains a class SoapClient but the API docs suggest I should have a SForceService class.  

The SoapClient does seem to have the methods necessary to interact with SalesForce.com, but the methods don't match the methods listed in the API.  For example SoapClient has the following method:

public DescribeGlobalResult describeGlobal(SessionHeader, CallOptions, PackageVersion[])

whereas the API seems to say the method should be

DescrineGlobalResult describeGlobal();

I can't help but think I imported this wrong somehow and am going down the wrong path.  Can anyone suggest where I may have gone wrong?