>Deleting a line from a datagridview is a no brainer :
>

>(bindingsource).RemoveCurrent()
>

so you insert a line as follows (it's simpler if your grid is not bound btw).
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           Dim r As (Datatable)Row = (Datatable).New(Datatable)Row
            Dim rIndex As Integer : rIndex = (grid).CurrentRow.Index
            (datatable).Rows.InsertAt(r, rIndex)
            Dim col As Integer = (grid).Columns((firstvisiblefield)).Index
            (grid).CurrentCell = grid(col, rIndex)
            (grid).Focus()
>