一段计算出勤补贴的代码，代码出错。

不同的核算标准和单位，其满勤补贴和缺勤扣除的标准也不同，"√"为满勤，得满勤补贴；"-1"为缺勤一天，得"满勤补贴" -" 缺勤扣除"，"-2"为缺勤2天，得"满勤补贴" -" 缺勤扣除"*2，以此类推。此段代码运行出错，请各位老师帮助指教，谢谢！！

\'报酬明细_DataColChanged

Select Case e.DataCol.Name
    Case "核算标准","单位"
        Dim dr As DataRow = e.DataRow
        Dim pr As DataRow
        Dim mqbt As Double
        If dr.IsNull("核算标准") OrElse dr.IsNull("单位") Then
            mqbt = Nothing
        Else
            Dim filter As String
            filter = "核算标准 = \'" & dr("核算标准") & "\' And 单位 = \'" & dr("单位") & "\'"
            pr = DataTables("核算标准").Find(filter)
            If pr IsNot Nothing Then
                mqbt =CDbl( pr("满勤补贴"))
            End If
        End If
End Select
Select Case e.DataCol.Name
    Case "核算标准","单位"
        Dim dr As DataRow = e.DataRow
        Dim pr As DataRow
        Dim qqkc As Double
        If dr.IsNull("核算标准") OrElse dr.IsNull("单位") Then
            qqkc = Nothing
        Else
            Dim filter As String
            filter = "核算标准 = \'" & dr("核算标准") & "\' And 单位 = \'" & dr("单位") & "\'"
            pr = DataTables("核算标准").Find(filter)
            If pr IsNot Nothing Then
                qqkc = CDbl(pr("缺勤扣除"))
            End If
        End If
End Select
If e.DataCol.Name = "出勤状况" Then
    If e.DataRow("出勤状况") = "√" Then
        e.DataRow("出勤补贴") = "mqbt"
    ElseIf e.DataRow("出勤状况") = "-1"
        e.DataRow("出勤补贴") = "mqbt-qqkc*1"
    ElseIf e.DataRow("出勤状况") = "-2"
        e.DataRow("出勤补贴") = "mqbt-qqkc*2"
    ElseIf e.DataRow("出勤状况") = "-3"
        e.DataRow("出勤补贴") = "mqbt-qqkc*3"
    ElseIf e.DataRow("出勤状况") = "-4"
        e.DataRow("出勤补贴") = "mqbt-qqkc*4"
    ElseIf e.DataRow("出勤状况") = "-5"
        e.DataRow("出勤补贴") = "mqbt-qqkc*5"
    Else
        e.DataRow("出勤补贴") = Nothing
    End If
End If

出错截图：

忘了上传项目，现补上，请各位老师指教，谢谢！！

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