Select Case e.DataCol.name

    Case "付款方式","业务途径","收款"

        e.DataRow("是否") = Not( e.DataRow.Isnull("付款方式") OrElse e.DataRow.Isnull("业务途径") OrElse e.DataRow.Isnull("收款"))

End Select

If e.DataCol.Name = "是否" AndAlso e.DataRow("是否") = True Then

    Dim count As Integer = DataTables("表B").compute("count(派单id)", "[派单id] = \'" & e.DataRow("派单id") & "\' and 截止日期 = #" & e.DataRow("截止日期") & "# and 付款方式 = \'" & e.DataRow("付款方式") & "\'")

    If count > 0 Then

        msgbox("财务收款添加,不能新增!2请核对!")

        Return

    End If

    Dim nma() As String = {"派单id","截止日期","收款","付款方式","业务途径"} \'A表数据来源列

    Dim nmb() As String = {"派单id","截止日期","应收款","付款方式","业务途径"} \'B表数据接收列

  

    Dim dr As DataRow = DataTables("表B").AddNew

    For i As Integer = 0 To nma.Length - 1

        dr(nmb(i)) = e.DataRow(nma(i))

    Next

End If

请问以上代码，怎么添加。判定  后台sql数据库里已添加了的对应子行只是没有加载进来，而不再添加呢？