主题：合并单元格，不合并的为何是倒着排的

我用帮助里“合并单元格”的代码合并，不合并的第一列是“序号”，结果不合并的那些内容是倒着排的。

请问怎么弄成正着排的？谢谢！

帮助里的代码如下，我只是改了表名和列名，其它的没变化：

Dim doc As New PrintDoc
Dim rt As New prt.RenderTable
Dim tb As Table = Tables("订单")
Dim ColNames As String() = New String(){"产品", "客户","单价","折扣","数量","金额","日期"}
Dim MergeCols As Integer = 2 '指定要合并的列数
tb.Sort = "产品,客户" '根据合并列排序
rt.Width = "Auto"
rt.SplitHorzBehavior = prt.SplitBehaviorEnum.SplitIfNeeded
rt.Style.Font = tb.Font
rt.Style.TextAlignVert = prt.AlignVertEnum.Center
rt.RepeatGridLinesVert = True '换页后重复表格线
For c As Integer = 0 To ColNames.Length - 1
    Dim lr As Integer ' 用于保存合并区域的起始行
    rt.Cells(0,c).Text = ColNames(c)
    rt.Cells(0,c).Style.TextAlignHorz = prt.AlignHorzEnum.Center
    rt.Cols(c).Width = tb.Cols(ColNames(c)).PrintWidth
    If tb.Cols(ColNames(c)).IsNumeric Orelse tb.Cols(ColNames(c)).IsDate Then
        rt.Cols(c).Style.TextAlignHorz = prt.AlignHorzEnum.Right
    End If
    For r As integer = 0 To tb.Rows.Count - 1
        If c <= MergeCols - 1 then '如果是要合并的列
            Dim Merge As Boolean = True
            If r = 0 Then
                Merge = False
            Else
                For n As Integer = 0 To c
                    if tb.Rows(r)(ColNames(n)) <> tb.Rows(r - 1)(ColNames(n))
                        Merge = False
                        Exit For
                    End If
                Next
            End If
            If Merge Then
                rt.Cells(lr,c).SpanRows = rt.Cells(lr,c).SpanRows + 1
            Else
                rt.Cells(r + 1, c).Text = tb.Rows(r)(ColNames(c))
                rt.Cells(r + 1, c).VertSplitBehavior = prt.CellSplitBehaviorEnum.Copy '换页后重复单元格
                lr = r + 1
            End If
        Else
            rt.Cells(r + 1, c).Text = tb.Rows(r)(ColNames(c))
        End If
    Next
Next
rt.Style.Gridlines.All = New prt.Linedef(Color.Gray)
rt.CellStyle.Spacing.All = 0.5
rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center
rt.RowGroups(0,1).Header = prt.TableHeaderEnum.All
doc.Body.Children.Add(rt)
doc.Preview()