I’ve seen several posts of how to add .cs files to your VS2008 BizTalk projects (Yossi has a good post), but none of them shows how to use them, which is not that obvious.
First of all, you can not use classes defined in the same project as the orchestration where you plan to use them. Secondly, and this is where I got stuck, – You don’t get any Intellisense!
But it will compile and work just fine.
Thanks to Jan Eliasen for the help.