为了动态汇总数据，使用Fill方法生成"设备折旧2"临时表，并想通过按钮代码进行运算。

下面这段代码，原来是放在"设备折旧"表的DataColChanged事件中的，现在想将其合并到上面的按钮代码中，应该如何修改，请各位老师指教，谢谢！！

\'产权单位
Select Case  e.DataCol.Name
    Case "去向"
        If e.DataRow.IsNull("去向") And  e.DataRow.IsNull("产权单位") Then
            e.DataRow("停用日期")=Nothing
        Else
            If e.DataRow.IsNull("去向") Then
                Dim mydate As Date = Forms("设备管理").Controls("DateTimePicker1").Text
                Dim y As Integer = mydate.Year
                Dim m As Integer = mydate.Month
                Dim Days As Integer = Date.DaysInMonth(y,m)
                Dim d As Date = New Date(y,m,Days)
                e.DataRow("停用日期") = d
                Dim dr As DataRow = DataTables("设备目录").Find("[设备编号] = \'" & e.DataRow("设备编号") & "\'")
                If dr IsNot Nothing Then
                    dr("产权单位") = e.DataRow("产权单位")
                End If
            End If
        End If
End Select
\'折旧结束
Select Case  e.DataCol.Name
    Case "停用日期"
        If e.DataRow.IsNull("停用日期") Then
            e.DataRow("折旧结束") = Nothing
        Else
            Dim dt As Date = e.DataRow("停用日期")
            e.DataRow("折旧结束") = new Date(dt.year,dt.month,Date.DaysInMonth(dt.year,dt.month))
        End If
End Select
\'折旧月数
Select Case  e.DataCol.Name
    Case "折旧开始","折旧结束"
        If e.DataRow.IsNull("折旧开始") And  e.DataRow.IsNull("折旧结束") Then
            e.DataRow("折旧月数")=Nothing
        Else
            Dim d1 As Date =  e.DataRow("折旧开始")
            Dim d2 As Date = e.DataRow("折旧结束")
            If d1>d2
                e.DataRow("折旧月数") = 0
            Else
                e.DataRow("折旧月数") = (d2.year - d1.year) * 12 + (d2.month - d1.month) + 1
            End If
        End If
End Select

For Each nr As DataRow In  DataTables("设备折旧2").DataRows
    If nr.IsNull("去向") And  nr.IsNull("产权单位") Then
        nr("停用日期")=Nothing
    Else
        If nr.IsNull("去向") Then
            Dim mydate As Date = Forms("设备管理").Controls("DateTimePicker1").Text
            Dim y As Integer = mydate.Year
            Dim m As Integer = mydate.Month
            Dim Days As Integer = Date.DaysInMonth(y,m)
            Dim d As Date = New Date(y,m,Days)
            nr("停用日期") = d
            Dim dr As DataRow = DataTables("设备目录").Find("[设备编号] = \'" & nr("设备编号") & "\'")
            If dr IsNot Nothing Then
                dr("产权单位") = nr("产权单位")
            End If
        End If
    End If
    If nr.IsNull("停用日期") Then
        nr("折旧结束") = Nothing
    Else
        Dim dt As Date = nr("停用日期")
        nr("折旧结束") = new Date(dt.year,dt.month,Date.DaysInMonth(dt.year,dt.month))
    End If
    If nr.IsNull("折旧开始") And  nr.IsNull("折旧结束") Then
        nr("折旧月数")=Nothing
    Else
        Dim d1 As Date =  nr("折旧开始")
        Dim d2 As Date = nr("折旧结束")
        If d1>d2
            nr("折旧月数") = 0
        Else
            nr("折旧月数") = (d2.year - d1.year) * 12 + (d2.month - d1.month) + 1
        End If
    End If
Next

狐爸老师，请帮助：

这段代码修改后，黄色部分出错，应如何改？

\'当月折旧
        If nr.IsNull("折旧开始") And  nr.IsNull("折旧结束") Then
            nr("当月折旧")=Nothing
        Else
            Dim mydate As Date = Forms("设备管理").Controls("DateTimePicker1").Text
            Dim y As Integer = mydate.Year
            Dim m As Integer = mydate.Month
            Dim a As Date =  New Date(y,m,1) \'月初
            Dim Days As Integer = Date.DaysInMonth(y,m)
            Dim b As Date = New Date(y,m,Days) \'月底
            Dim c As Date = nr("折旧开始")
            Dim d As Date = nr("折旧结束")
            Dim f As Byte = DataTables("设备折旧").Compute("Sum(折旧月数)","[设备编号] = \'" & e.NewValue & "\'") \'同设备编号的折旧月数合计
            Dim g As Byte = nr("折旧年限")
            If c > d OrElse b < c OrElse a > d OrElse f > g*12 Then
                nr("当月折旧")= 0
            Else
                nr("当月折旧") = nr("月折旧费")
            End If
        End If

另外一段也请帮助看看，再次衷心感谢！！

\'折旧累计
Dim tq,tq1,yf,js As Double
Dim ys,i As Integer
Select Case  e.DataCol.Name
    Case "设备编号"
        Dim dr As DataRow = e.DataRow
        If e.DataCol.Name = "设备编号" Then
            tq = DataTables("设备折旧").Compute("Sum(折旧累计)","[设备编号] = \'" & e.NewValue & "\'and [启用日期] < #" & dr("启用日期") & "#")  \'此行同设备编号在启用日期以前发生的折旧累计
            tq1 = tq
        End If
        ys = dr("折旧月数")
        yf = dr("月折旧费")
        js = dr("折旧基数")
        For i = 0 To 100
            If i = ys Then
                Exit For
            End If
            If js - tq > yf Then
                tq = tq + yf
            Else
                tq = tq + ( js - tq )
            End If
        Next
        tq = tq - tq1
        dr("折旧累计") = tq
        \'   End If
End Select