DataGridView adds blank row to dataset - how do I get it to ignore the blank row?

Experts, I have an issue that puzzles me.  In my datagridview (the topic of a few questions from me over the last week) users can add rows and everything is now working dandy.  The only trouble is that it also adds the new blank row at the bottom of the datagridview to my dataset as well, and this is undesirable.

The row is not completely blank, since I am adding primary key data programmatically once a user enters a new row (snippet below).  Since it has that data, the datagridview/bindingsource considers it to be a valid record.  I don't expect anyone to write my code for me...do you have any tips on how I should attempt to block that row without any other effects (such as failing to save the other rows or pestering the user with a message)?

Thanks in advance!Start Free Trial

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Private Sub dgvEncumbr_RowValidating(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles dgvEncumbr.RowValidating
        With dgvEncumbr.CurrentRow
            .Cells("PONo").Value = textPONo.Text
        End With
    End Sub