>I think I found it.
>
>

>xref.AcceptChanges();  // Does not send update back to source.
>ta.Update(xref);       // Does send update back to source.
>

>
>But if you call AcceptChanges before Update... nothing gets sent.
>
>Not sure I get the usefullness of AcceptChanges, but at least I get why I'm not updating.

Yes, the .AcceptChanges only "finalizes" the changes in the datatable... you need to reconcile the differences back to the SQL table. And really, I think you should be sending the change back to the database and if there are no errors, do an .AcceptChanges.

Sorry about not replying sooner...