主题：IF问题

datacolchanged事件

Select Case e.DataCol.name
    Case "A", "B"
        Dim drs As List(Of DataRow) = e.DataTable.Select("A = '" & e.DataRow("A") & "'", "B desc")
        If drs.count > 0 Then
            drs(0)("c") = "正确"
            For i As Integer = 1 To drs.count-1
                drs(i)("C") = Nothing
            Next
        End If
End Select