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Concurrency violation

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I create a dataadapter in code using an SQLCommand Builder and
TableMapping, and fill a dataset. After I add the rows to the datatable
(through a datagrid) and try to update/delete them, I get a Concurrency
violation error. If I close a form and open it again, everything works fine.
If I create the dataadapter in design mode, everything also works fine.
What may be wrong here?


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