Hi DavidL, I've done as you've suggested, however I still get this message when hovering over my breakpoint: no symbols have been loaded for this document any ideas, Martin Edit: when you get to the point in your workflow where you placed the breakpoint... all is well :-)

Thank you, it worked as you've said. But there is an issue when i try to access either K2.ProcessInstance.XmlFields or K2.ProcessInstance.DataFields from the Watch window of the Visual Studio. it throws error:   K2.ProcessInstance.XmlFields    Cannot obtain fields or call methods on the instance of type ...

You're on the right track attaching to the K2HostServer.exe.  When you attach the debugger, choose to debug managed code only.  The exclamation points will go away when the host server loads your assembly and your breakpoint will be hit when it is executed. The host server takes care of versioning your process, so make sure the process ...