Hi Vesa,
Thank you for your interest in Syncfusion products.
The fields can't be updated by DocIO, it should be updated only after opened in MS word and by pressing F9 or select the fields and by giving update field. Since these fields values can''t be set during document creation. The fields are only updated after opened by MS word.
As a workaround please use create one macro like give below in any of your word document. This will automatically updates when ever any documents opened. The AutoOpen macro automatically runs when the document opens.
Sub AutoOpen()
Dim aStory As Range
Dim aField As Field
For Each aStory In ActiveDocument.StoryRanges
For Each aField In aStory.Fields
aField.Update
Next aField
Next aStory
End Sub
Here is the link more about automatically updates fields
http://support.microsoft.com/kb/212703/ Please let me know if you have any questions.
Best Regards,
Bhuvana