主题：帮我简化下这个窗口筛选代码

Dim Filter As String

With e.Form.Controls("a")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "负责工程师 = '" & .Value & "'"
    End If
End With

With e.Form.Controls("b")
    If .Value IsNot Nothing Then
        If Filter > "" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "任务进行状态 < '" & .Value & "' or 任务进行状态 > '" & .Value & "'"
    End If
End With

With e.Form.Controls("c")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "实际结束时间 >= #" & .Value & "#"
    End If
End With

With e.Form.Controls("d")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "实际结束时间 <= #" & .Value & "#"
    End If
End With

If Filter > "" Then
    Tables("工作任务表").Filter = Filter
End If

请各位高手们帮我简化下这个按钮事件代码。
同时确认下With-----End With 在上面的代码使用过程中是不是有选后顺序之分？
Filter = Filter & "任务进行状态 < '" & .Value & "' or 任务进行状态 > '" & .Value & "'"
改成Filter = Filter & "任务进行状态 <> '" & .Value & "'"  为什么改成这样不行？
 Filter = Filter & "实际结束时间 <= #" & .Value & "#"  这里面有<又有=为什么行，为什么上面的 < 和 > 就不行了