主题：[求助]下述代码哪儿出错了，出现错误对话框，请指教

Select e.DataCol.Name
    Case "批准日期","备注"
        If e.DataRow.IsNull("批准日期") Then
            e.DataRow("归档号") = Nothing
        Else
            Dim d As Date = e.DataRow("批准日期")
            Dim y As Integer = d.Year
            Dim m As Integer = d.Month
            Dim Days As Integer = Date.DaysInMonth(y,m)
            Dim fd As Date = New Date(y,1,1) '获得该年的第一天
            Dim ld As Date = New Date(y,12,31) '获得该年的最后一天
            Dim s = e.DataRow( "备注")
           
            Dim bh As String = e.DataRow("全宗号") & "-" &"〔" & Format(d,"yyyy") & "〕" & "-"
           
            If s Like "伤残*" Then
                bh &= "SC-"
            ElseIf s Like "病退*" Then
                bh &= "BT-"
            End If
           
            If e.DataRow("归档号").StartsWith(bh) = False '如果单据编号前缀不符
                Dim max As String
                Dim idx As Integer
                Dim flt As String
                flt = "归档号 like '" & bh & "%' And 批准日期 >= #" & fd & "# And 批准日期 <= #" & ld & "# and _identify <> " & e.DataRow("_identify")
                max = e.DataTable.Compute("Max(归档号)",flt) '取得该年的相同工程代码的最大单据编号
                If max > "" Then '如果存在最大单据编号
                    idx = max.LastIndexOf("-") + 1
                    idx = CInt(max.Substring(idx,4)) + 1 '获得最大单据编号的后四位顺序号,并加1
                Else
                    idx = 1 '否则顺序号等于1
                End If
                e.DataRow("归档号") = bh & Format(idx,"0000") & "号"
            End If
        End If
End Select