主题：[求助]代码问题

If Tables("入库明细").allowedit = True Then
    Dim Result As DialogResult
    result = MessageBox.show("入库单尚未保存,如果要保存请点是?","提示",MessageBoxButtons.yesno,MessageBoxIcon.Question)
    If Result = DialogResult.Yes Then
        Tables("入库明细").save
        Tables("入库").save
        Tables("台账").save
Dim Cols1() As String = {"单号","品号","品名","数量"}
Dim Cols2() As String = {"单号","品号","品名","入库"}
 For Each dr1 As DataRow In DataTables("入库明细").Select("[单号] = '" & e.Form.Controls("TextBox1").text & "' ")
    Dim dr2 As DataRow = DataTables("台账").AddNew()
    For i As Integer = 0 To Cols1.Length -1
        dr2(Cols2(i)) = dr1(Cols1(i))
    Next
Next

       
Else
 DataTables("入库明细").RejectChanges()
        DataTables("台账").RejectChanges()

End  If
End If

请问各位老师，为什么不执行 “DataTables("台账").RejectChanges()”