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Which workflow intance Id field should I use?

I have two kind of workflows in my project (associated with document in doclib and associated with basic list item in task list.

I have been told that "ows_WorkflowInstanceID" is only for documentlibrary workflows... Still I am getting same IDs from both of those field despite which workflow task I get that value from.

And I try to get those ID from workflow task itself...

Guid tempIdOWS = new Guid(item["ows_WorkflowInstanceID"].ToString());

Guid tempIdBuiltIn = new Guid(item[SPBuiltInFieldId.WorkflowInstanceID].ToString());

Thanks in advance

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up vote 0 down vote accepted

You instead tried the SPListItem.Workflows property to get information about workflow instances running for a particular item?

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It would be great to use just that approach. I want to have Ids because I query tasklists with CAML and there are same tasks which belong to same wokflow.. My approach is to filter unique intance IDs from SPListITemCollection that I get in CAML query. It raises a question: Can workflow instance IDs query with CAML clause ? That would be awesome?! –  SAV Sep 19 '10 at 14:17
    
On second thought... it still would give me same results. –  SAV Sep 19 '10 at 14:36
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