获取gridview中EmptyDataTemplate（空模板）值

前台代码：      <EmptyDataTemplate>
                <div id="head">
                    <table style="width: 902px; height: 294px; background-color:Black;">
                        <tr>
                             <tr style="color:Silver;background-color:Black;font-weight:bold; width:5px; height:5px">
                            <td scope="col">选择</td>
                            <td scope="col">货号</td>
                             <td scope="col">品名</td>
                             <td scope="col">规格</td>
                             <td scope="col">单位</td>
                             <td scope="col">数量</td>
                             <td scope="col">单价</td>
                             <td scope="col">金额</td>
                             <td scope="col">条码</td>
                            <td scope="col">删除</td>
                       </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="chk_Del" runat="server" /></td>
                             <td scope="col" runat="server" id="lb1"></td>
                             <td scope="col" runat="server" id="lb2"></td>
                             <td scope="col" runat="server" id="lb3"></td>
                             <td scope="col" runat="server" id="lb4"></td>
                             <td scope="col" runat="server" id="lb5"></td>
                             <td scope="col" runat="server" id="lb6"></td>
                             <td scope="col" runat="server" id="lb7"></td>
                             <td scope="col" runat="server" id="lb8"></td>
                             <td scope="col"><asp:Button ID="btnDelete" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                       </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="CheckBox1" runat="server" /></td>
                             <td scope="col" runat="server" id="lb9"></td>
                             <td scope="col" runat="server" id="lb10"></td>
                             <td scope="col" runat="server" id="lb11"></td>
                             <td scope="col" runat="server" id="lb12"></td>
                             <td scope="col" runat="server" id="lb13"></td>
                             <td scope="col" runat="server" id="lb14"></td>
                             <td scope="col" runat="server" id="lb15"></td>
                             <td scope="col" runat="server" id="lb16"></td>
                            <td scope="col"><asp:Button ID="Button3" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                        </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="CheckBox2" runat="server" /></td>
                             <td scope="col" runat="server" id="lb17"></td>
                             <td scope="col" runat="server" id="lb18"></td>
                             <td scope="col" runat="server" id="lb19"></td>
                             <td scope="col" runat="server" id="lb20"></td>
                             <td scope="col" runat="server" id="lb21"></td>
                             <td scope="col" runat="server" id="lb22"></td>
                             <td scope="col" runat="server" id="lb23"></td>
                             <td scope="col" runat="server" id="lb24"></td>
                             <td scope="col"><asp:Button ID="Button4" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                       </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="CheckBox3" runat="server" /></td>
                             <td scope="col" runat="server" id="lb25"></td>
                             <td scope="col" runat="server" id="lb26"></td>
                             <td scope="col" runat="server" id="lb27"></td>
                             <td scope="col" runat="server" id="lb28"></td>
                             <td scope="col" runat="server" id="lb29"></td>
                             <td scope="col" runat="server" id="lb30"></td>
                             <td scope="col" runat="server" id="lb31"></td>
                             <td scope="col" runat="server" id="lb32"></td>
                            <td scope="col"><asp:Button ID="Button5" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                        </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                            <td scope="col"><asp:CheckBox ID="CheckBox4" runat="server" /></td>
                             <td scope="col" runat="server" id="lb33"></td>
                             <td scope="col" runat="server" id="lb34"></td>
                             <td scope="col" runat="server" id="lb35"></td>
                             <td scope="col" runat="server" id="lb36"></td>
                             <td scope="col" runat="server" id="lb37"></td>
                             <td scope="col" runat="server" id="lb38"></td>
                             <td scope="col" runat="server" id="lb39"></td>
                             <td scope="col" runat="server" id="lb40"></td>
                             <td scope="col"><asp:Button ID="Button6" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                       </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="CheckBox5" runat="server" /></td>
                             <td scope="col" runat="server" id="lb41"></td>
                             <td scope="col" runat="server" id="lb42"></td>
                             <td scope="col" runat="server" id="lb43"></td>
                             <td scope="col" runat="server" id="lb44"></td>
                             <td scope="col" runat="server" id="lb45"></td>
                             <td scope="col" runat="server" id="lb46"></td>
                             <td scope="col" runat="server" id="lb47"></td>
                             <td scope="col" runat="server" id="lb48"></td>
                             <td scope="col"><asp:Button ID="Button7" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                        </tr>
                        <tr>
                             <tr style="background-color:Silver; width:5px; height:5px;">
                             <td scope="col"><asp:CheckBox ID="CheckBox6" runat="server" /></td>
                             <td scope="col" runat="server" id="lb49"></td>
                             <td scope="col" runat="server" id="lb50"></td>
                             <td scope="col" runat="server" id="lb51"></td>
                             <td scope="col" runat="server" id="lb52"></td>
                             <td scope="col" runat="server" id="lb53"></td>
                             <td scope="col" runat="server" id="lb54"></td>
                             <td scope="col" runat="server" id="lb55"></td>
                             <td scope="col" runat="server" id="lb56"></td>
                             <td scope="col"><asp:Button ID="Button8" runat="server" CssClass="button1" Text="刪除" CommandName="Del" OnClientClick="return window.confirm('您確定要刪除哱')" /></td>
                       </tr>
                    </table>
                </div>
            </EmptyDataTemplate>
后台代码：
        PurchBilling addpurchbilling = new PurchBilling();        PurchBillingBLL purchbillingbll = new PurchBillingBLL();        if (purchbillingbll.AddPurchBilling(addpurchbilling))
        {
            XiPurchBilling addxipurchbilling = new XiPurchBilling();            addxipurchbilling.PurchBilling_id = txtpurchbillingid.Text;           for (int i = 0; i<gvdata.Rows.Count; i++)   
            {                
                addxipurchbilling.Goods_id = Convert.ToInt32(gvdata.Rows[i].Cells[0].Text.ToString());
                addxipurchbilling.Goods_name = gvdata.Rows[i].Cells[1].Text.ToString();
                addxipurchbilling.Specifications = gvdata.Rows[i].Cells[2].Text.ToString();
                addxipurchbilling.Units_of_measurement = gvdata.Rows[i].Cells[3].Text.ToString();
                addxipurchbilling.PurchBilling_number = Convert.ToInt32(gvdata.Rows[i].Cells[4].Text.ToString());
                addxipurchbilling.PurchBilling_unitprice = Convert.ToDecimal(gvdata.Rows[i].Cells[5].Text.ToString());
                addxipurchbilling.PurchBilling_price = Convert.ToDecimal(gvdata.Rows[i].Cells[6].Text.ToString());
                addxipurchbilling.Goods_barcode = gvdata.Rows[i].Cells[7].Text.ToString();                             
            }
            if (purchbillingbll.AddXiPurchBilling(addxipurchbilling))
            {
                Response.Write("<Script>alert('添加信息成功')</Script>");
            }
            else
                Response.Write("<Script>alert('添加信息失败')</Script>");
        }