主题：箱号的代码

If e.DataCol.Name = "口岸" Then

   If e.NewValue Is Nothing Then

      e.datarow("开始箱号") = Nothing

   Else

      Dim dr As DataRow = DataTables("装箱单").Find("[订单号] = '" & e.datarow("订单号") & "' And [口岸] = '" & e.NewValue & "' And [结束箱号] > 0","_identify Desc")

      if dr IsNot Nothing Then

         e.datarow("开始箱号") = dr("结束箱号")+1

      End if

   End if

ElseIf e.DataCol.Name = "开始箱号" OrElse e.Datacol.Name = "箱数"  Then

    If e.Datarow.IsNull("开始箱号") = False AndAlso e.Datarow.IsNull("箱数") = False Then

        e.DataRow("结束箱号") =  e.DataRow("开始箱号")  +e.DataRow("箱数") -1

    End If

End if