Have you ever built a K2 Workflow only to get a really helpful error pointing toward Workflow.targets? A source code file and line number would be a big help – especially when it’s something like the use of an unassigned variable.

The solution isn’t obvious – simply right click on suspect events and view the code (having the XOML file open is fine – no need for individual CS files). When you build with the XOML open you will get two errors for each real error – one will point to Workflow.targets and the other to the actual file (line number and everything).