Can you also tell us
-which IDE you are using ?
-the version of the .NET Framework ? (curr. 2.0x)
-and the version of the .NET Connector (currently 2.0)?
Searching for CPIC @ service.sap.com didn't find any results, so I think it's a problem with .NET
But here's an alternative: http://www.erpconnect.net/EC_DE/index.php
(30 day trial)