主题：[求助][讨论]

生产通知单增加一行，明细表1和明细表2增加八行，现在要对这八行进行操作，如果明细表1支数列为空则删除，不为空则保存，以下代码错在哪里Dim t1 As Table=Tables("生产通知单明细1")
Dim t2 As Table =Tables("生产通知单明细2")
For i As Integer = Tables("生产通知单明细1").Rows.count-8 To Tables("生产通知单明细1").Rows.count-1
 Dim dr1 As Row = t1.Rows(i)
 Dim dr2 As Row =t2.Rows(i)
If dr1("支数") IsNot Nothing Then
 dr1.save()
 dr2.save()
Else
 dr1.delete()
 dr2.delete()
 End If
Next