主题：程序问题

老师，对于这个程序如果改为用Filter 会报错,这两个程序的本质有什么区别么

Dim drs As List(Of DataRow)
drs = DataTables("订单").Select("[产品] = 'PD01' And [日期]= #1/4/1999#")
For Each dr As Datarow In drs
    Output.show(dr("客户"))
Next

Dim drs As List(OfRow)
drs = Tables("订单").Filter="[产品] = 'PD01' And [日期]= #1/4/1999#"
For Each dr As Datarow In drs
    Output.show(dr("客户"))
Next