You table name must not be mnuTabls then.

>I changed it to the following, and it now works fine
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oDataRow = oDataSet.Tables[0].NewRow();

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>Thanks
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>> oDataRow = oDataSet.Tables["mnuTabs"].NewRow();
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>>Are you 100% certain that you have a datatable called mnuTabs? As Bill suggested, suspend the application and check oDataSet.Tables["mnuTabs"] to make sure that it's actually a table with columns.