Dear all,

I have a state machine workflow hosted under asp.net 2.0, using SimpleReadWriteActivities and LocalServiceContract from the HelpDeskSupport sample app. This uses static lists to keep track of data pipes, but has no mechanism for cleaning these up. I have added this capability, in order to get consistent behaviour after a re-start of the host web site.

Everything works fine unless I return to a state which has already been executed once, and execute it again. The state concerned has an EventDrivenActivity which contains a ReceiveDataFromHost activity, derived from HandleExternalEventActivity.

When the ReceiveDataFromHost activity gets called the second time, I get an exception with message:

Correlation value on declaration "ReminderData" is already initialized.

Dear all,

Having had no response concerning this issue, I have gone through the code of the SimpleReadWriteActivities and LocalServiceContract in the sample app and modified them to work reliably with a state machine workflow which loops back to previousd states.

I solved the problem by adding a mechanism for removing datapipes when I have finished with them and removing the use of correlation tokens.

If anyone else needs it, I could upload the modified classes to this forum.