主题：后台筛选代码如何改？如何显示出来？

Dim Filter As String

With e.Form.Controls("单位")

    If .Value IsNot Nothing Then

        Filter = "单位 = '" & .Value & "'"

    End If

End With

With e.Form.Controls("经济体单元")

    If .Value IsNot Nothing Then

        If Filter > "" Then

            Filter = Filter & " And "

        End If

        Filter = Filter & "经济体单元 = '" & .Value & "'"

    End If

End With

如何改成从后台筛选？请教有劳各位前辈了。