datalist中嵌套datagrid 8/2

html
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<asp:datalist id="datalist1" Width="690px" BorderStyle="None" ShowFooter="False" GridLines="Both"
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Runat="server">
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<HeaderTemplate>
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<table style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: white; FONT-FAMILY: 新細明體">
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<tr>
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<td style="WIDTH: 120px; TEXT-ALIGN: center">傳票單號</td>
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<td style="WIDTH: 120px; TEXT-ALIGN: center">入帳日期</td>
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<td style="WIDTH: 120px; TEXT-ALIGN: center">傳票狀態</td>
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<td style="WIDTH: 120px; TEXT-ALIGN: right">本幣借方</td>
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<td style="WIDTH: 120px; TEXT-ALIGN: right">本幣貸方</td>
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<td style="WIDTH: 60px; TEXT-ALIGN: center">審核</td>
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</tr>
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</table>
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</HeaderTemplate>
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<AlternatingItemStyle BackColor="#DBC4C4"></AlternatingItemStyle>
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<ItemTemplate>
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<table style=" FONT-SIZE: 9pt; FONT-FAMILY: 新細明體">
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<tr>
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<td style="WIDTH: 120px; TEXT-ALIGN: center ">
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<asp:linkbutton ID="accno" Runat=server text='<%#databinder.eval(container.dataitem,"傳票單號") %>' CommandName="select" />
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</td>
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<td style="WIDTH: 120px; TEXT-ALIGN: center "><%# container.dataitem("入帳日期")%></td>
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<td style="WIDTH: 120px; TEXT-ALIGN: center; "><%# container.dataitem("傳票狀態")%></td>
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<td style="WIDTH: 120px; TEXT-ALIGN: right; "><%# container.dataitem("本幣借方")%></td>
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<td style="WIDTH: 120px; TEXT-ALIGN: right; "><%# container.dataitem("本幣貸方")%></td>
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<td style="WIDTH: 60px; TEXT-ALIGN: center; ">
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<asp:CheckBox ID="cb" Runat=server Checked='<%# Databinder.eval(container.dataitem,"審核") %>' /></td>
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</tr>
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<tr>
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<td colspan="6">
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<asp:DataGrid ID="Datagrid1" Runat="server" AutoGenerateColumns="False" Font-Name="新細明體" Font-Size="9pt"
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GridLines="Both" BorderStyle="None">
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<Columns>
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<asp:BoundColumn DataField="seq" HeaderText="序" ItemStyle-Width="10px" ItemStyle-HorizontalAlign="center"></asp:BoundColumn>
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<asp:BoundColumn DataField="acccode" HeaderText="科目" ItemStyle-Width="60px"></asp:BoundColumn>
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<asp:BoundColumn DataField="accname" HeaderText="科目名稱" ItemStyle-Width="100px"></asp:BoundColumn>
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<asp:BoundColumn DataField="remark" HeaderText="摘要" ItemStyle-Width="200px"></asp:BoundColumn>
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<asp:BoundColumn DataField="ckind" HeaderText="幣別" ItemStyle-Width="40px" ></asp:BoundColumn>
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<asp:BoundColumn DataField="cramt" HeaderText="原幣借方" ItemStyle-Width="80px" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign=Right></asp:BoundColumn>
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<asp:BoundColumn DataField="dramt" HeaderText="原幣貸方" ItemStyle-Width="80px" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign=Right></asp:BoundColumn>
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<asp:BoundColumn DataField="crate" HeaderText="匯率" ItemStyle-Width="50px" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign=Right></asp:BoundColumn>
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<asp:BoundColumn DataField="camt" HeaderText="本幣借方" ItemStyle-Width="80px" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign=Right></asp:BoundColumn>
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<asp:BoundColumn DataField="damt" HeaderText="本幣貸方" ItemStyle-Width="80px" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign=Right></asp:BoundColumn>
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</Columns>
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</asp:DataGrid></td>
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</tr>
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</table>
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</ItemTemplate>
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<HeaderStyle BorderStyle="None" BackColor="#B58383"></HeaderStyle>
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</asp:datalist>

Code:
page_load事件:
...
            datalist1.DataSource = dt
            datalist1.DataBind()
            datalist1.Visible = True

            Dim accno As String
            For inta = 0 To datalist1.Items.Count - 1
                accno = CType(datalist1.Items(inta).FindControl("accno"), LinkButton).Text
                Dim datagrid1 As DataGrid = CType(datalist1.Items(inta).FindControl("datagrid1"), DataGrid)
                ...
                datagrid1.DataSource = dt
                datagrid1.DataBind()
                datagrid1.Visible = False
            Next

datalist1_ItemCommand事件:
        Dim dg As DataGrid = CType(e.Item.FindControl("datagrid1"), DataGrid)
        If dg.Visible = True Then
            dg.Visible = False
        Else
            dg.Visible = True
        End If