主题：自动复制行的时候，数据列可否变成负数?

如果列名不同，或者只需复制部分列，可以参考下面的代码：

If e.DataCol.Name = "逻辑列名" AndAlso e.DataRow("逻辑列名") = True Then
    Dim nma() As String = {"A1","A2","A3","A4"} 'A表数据来源列
    Dim nmb() As String = {"B1","B2","B3","B4"} '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

如果我有一列数据列 比如 “数量”

Dim nma() As String = {"A1","A2","A3","A4","数量"}

复制到新的表的时候 我想让他变成负数。怎么弄呢？