Plugin use the polarion webservice

[Oliver Stohr]

Hello, I want to access to polarion workitems through webservice by language C# and VS2010 express.
I have created web service representation classes with cmd "wsdl ..."

It works!! I can get, query or create workitems !!!
But only if I use it in a stand-alone application !

Problem:
I have created a C# plug in for EA (version 9.2.922). The Addin itself works fine!
When I access and query polarion items from the EA Addin, I get the same number of polarion items, but they are empty (null).

This problem is always described here http://forums.polarion.com/viewtopic.php?f=5&t=9145
but the described solution is not working.

I hope somone can help me  

Oliver