主题：请问如何写合并相同单元格的代码呀

此主题相关图片如下：2.jpg

请指教：我想变成如下格式：

原代码如下：

Dim dt As DataTable
Dim g As New GroupTableBuilder("统计表1", DataTables("fenfa"))
g.Groups.AddDef("faby")
g.Groups.AddDef("pian")
g.Groups.AddDef("zzrq", DateGroupEnum.Year, "年")
g.Groups.AddDef("baom")
g.Totals.AddDef("fens")
g.Filter = "[zzrq] >= '1/1/2012 ' And [zzrq] <= '12/31/2012 ' And [pian] = '城西 '"
g.FromServer = True
dt = g.Build(True)
Dim doc As New PrintDoc
Dim rt As New prt.RenderTable
Dim Count As Integer = 0
For Each Col As DataCol In Dt.DataCols
    rt.Cells(0,Count).Text = Col.Name
    For r As Integer = 0 To dt.DataRows.Count - 1
        rt.Cells(r +1,Count).Text = dt.DataRows(r)(Col.Name)
    Next
    Count = Count + 1
Next
rt.Style.Gridlines.All = New prt.Linedef(Color.Gray)
rt.CellStyle.Spacing.All = 1
rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center
doc.Body.Children.Add(rt)
doc.Preview()

Dim dt As DataTable
Dim g As New GroupTableBuilder("统计表1", DataTables("fenfa"))
g.Groups.AddDef("faby")
g.Groups.AddDef("pian")
g.Groups.AddDef("zzrq", DateGroupEnum.Year, "年")
g.Groups.AddDef("baom")
g.Totals.AddDef("fens")
g.Filter = "[zzrq] >= '1/1/2012 ' And [zzrq] <= '12/31/2012 ' And [pian] = '城西 '"
g.FromServer = True
dt = g.Build(True)
Dim doc As New PrintDoc
Dim rt As New prt.RenderTable
Dim Count As Integer = 0
For Each Col As DataCol In Dt.DataCols
    rt.Cells(0,Count).Text = Col.Name
    For r As Integer = 0 To dt.DataRows.Count - 1
        rt.Cells(r +1,Count).Text = dt.DataRows(r)(Col.Name)
    Next
    Count = Count + 1
Next
rt.Style.Gridlines.All = New prt.Linedef(Color.Gray)
rt.CellStyle.Spacing.All = 1
rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center
doc.Body.Children.Add(rt)
doc.Preview()

上面代码和您给的代码，不会组合了，请给提示