c# สอบถามหน่อยค่ะ asp.net ในหน้า code หาชื่อในหน้า design ไม่เจอค่ะ

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using PAMS_Library;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
using MyComLib;




public partial class Manage : System.Web.UI.Page
{

    ClsManage _ClsManage = new ClsManage();

    private void setvalue()
    {
        _ClsManage._Al_id = hdAl_id.Value;
        _ClsManage._album_id = txtAl_id.Text;
        _ClsManage._album_name = txtAl_name.Text;
        _ClsManage._album_detail = txtAl_detail.Text;
        _ClsManage._album_dateact = txtAl_time.Text;
        _ClsManage._album_place = txtAl_place.Text;
        _ClsManage._dep_id = ddlDep_id.SelectedValue;
        _ClsManage._type_id = ddlType_id.SelectedValue;
        _ClsManage._album_counter = txtAl_count.Text;
        _ClsManage._point_total = txtAl_point.Text;
        _ClsManage._vote_total = txtAl_vote.Text;

    }
    
    
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

<%@ Page Language="C#" MasterPageFile="~/design/MasterPage.master" ValidateRequest="false" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Untitled Page" %>
<%@ Import Namespace="Artisteer" %>
<%@ Register TagPrefix="artisteer" Namespace="Artisteer" %>
<%@ Register TagPrefix="art" TagName="DefaultMenu" Src="DefaultMenu.ascx" %> 
<%@ Register TagPrefix="art" TagName="DefaultHeader" Src="DefaultHeader.ascx" %> 


<%@ Register assembly="GMDatePicker" namespace="GrayMatterSoft" tagprefix="cc1" %>


<asp:Content ID="PageTitle" ContentPlaceHolderID="TitleContentPlaceHolder" Runat="Server">
    Page title here...
</asp:Content>

<asp:Content ID="HeaderContent" ContentPlaceHolderID="HeaderContentPlaceHolder" Runat="Server">
    <art:DefaultHeader ID="DefaultHeader" runat="server" />
</asp:Content>
<asp:Content ID="MenuContent" ContentPlaceHolderID="MenuContentPlaceHolder" Runat="Server">
    <art:DefaultMenu ID="DefaultMenuContent" runat="server" />
</asp:Content>

<asp:Content ID="SheetContent" ContentPlaceHolderID="SheetContentPlaceHolder" Runat="Server">
    <br />
    <br />
    <asp:Panel ID="Panel1" runat="server" HorizontalAlign="Center" Width="1032px">
        <br />
        <br />
        <table align="center" bgcolor="#996633" border="0" cellpadding="1" 
        cellspacing="1" frame="border">
            <tr>
                <td bgcolor="#FFFFFF" colspan="2" class="style3">
                    จัดการอัลบั้มภาพกิจกรรม<asp:HiddenField ID="hdAl_id" runat="server" />
                </td>
            </tr>
            <tr>
                <td bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        รหัสอัลบั้ม&nbsp;<strong> :</strong>
                    </div>
                </td>
                <td bgcolor="#FFFFFF" valign="middle" class="style5" align="left">
                    &nbsp;
                    <asp:TextBox ID="txtAl_id" runat="server" Width="183px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        ชื่ออัลบั้ม&nbsp;&nbsp; <strong>:</strong>
                    </div>
                </td>
                <td bgcolor="#FFFFFF" class="style5" valign="middle" align="left">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_name" runat="server" MaxLength="200" 
                        Width="187px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style6">
                    <div align="left">
                        รายละเอียด <strong>&nbsp;:</strong>
                        <br />
                    </div>
                </td>
                <td bgcolor="#FFFFFF" class="style7" valign="middle" align="left">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_detail" runat="server" Height="40px" MaxLength="200" 
                        TextMode="MultiLine" Width="339px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        ช่วงเวลา <strong>&nbsp;:</strong>
                    </div>
                </td>
                <td bgcolor="#FFFFFF" class="style5" valign="middle" align="left">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_time" runat="server" MaxLength="200" 
                        Width="187px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;วันที่เริ่ม <strong>:</strong>
                    </div>
                </td>
                <td bgcolor="#FFFFFF" class="style5" valign="middle" align="left">
                    &nbsp;&nbsp;<cc1:GMDatePicker ID="GMDatePicker1" runat="server">
                    </cc1:GMDatePicker>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;วันที่สิ้นสุด <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<cc1:GMDatePicker ID="GMDatePicker2" runat="server">
                    </cc1:GMDatePicker>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;สถานที่ <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_place" runat="server" MaxLength="50" Width="348px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;หน่วยงานที่จัด <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:DropDownList ID="ddlDep_id" runat="server">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;ประเภทกิจกรรม <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:DropDownList ID="ddlType_id" runat="server">
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;จำนวนผู้เข้าชมเริ่มต้น <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_count" runat="server" MaxLength="50" Width="140px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;คะแนนโหวต <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_point" runat="server" MaxLength="50" Width="141px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="right" bgcolor="#FFFFFF" class="style4">
                    <div align="left">
                        &nbsp;จำนวนคนโหวต <strong>:</strong>
                    </div>
                </td>
                <td align="left" bgcolor="#FFFFFF" class="style5" valign="middle">
                    &nbsp;&nbsp;<asp:TextBox ID="txtAl_vote" runat="server" MaxLength="50" Width="140px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td align="center" bgcolor="#FFFFFF" colspan="2" height="45" valign="middle">
                    <asp:Button ID="btnaad" runat="server" Text="เพิ่ม" Height="30px" 
                        Width="88px" />
                    &nbsp;&nbsp;&nbsp;<asp:Button ID="btnedit" runat="server" Height="30px" 
                        Text="แก้ไข" Width="88px" />
                    &nbsp;&nbsp;
                    <asp:Button ID="btndelete" runat="server" 
                    Text="ลบ" Height="30px" Width="88px" />
                    &nbsp;&nbsp;
                    <asp:Button ID="btncancel0" runat="server" Height="30px" Text="ยกเลิก" 
                        Width="88px" />
                </td>
            </tr>
        </table>
        <br />
        <br />
        <br />
        <asp:GridView ID="gvManage" runat="server" AutoGenerateColumns="False" 
            BackColor="White" BorderColor="#DEDFDE" BorderWidth="1px" 
            CellPadding="4" DataKeyNames="album_id" ForeColor="Black" GridLines="Vertical" 
            style="margin-left: 0px" BorderStyle="None" 
            DataSourceID="AccessDataSource1">
            <RowStyle BackColor="#F7F7DE" />
            <Columns>
                <asp:BoundField DataField="album_id" HeaderText="album_id" ReadOnly="True" 
                    SortExpression="album_id">
                </asp:BoundField>
                <asp:BoundField DataField="album_name" 
                    HeaderText="album_name" SortExpression="album_name">
                </asp:BoundField>
                <asp:BoundField DataField="album_detail" HeaderText="album_detail" 
                    SortExpression="album_detail" />
                <asp:BoundField DataField="album_dateact" HeaderText="album_dateact" 
                    SortExpression="album_dateact" />
                <asp:BoundField DataField="album_sdate" HeaderText="album_sdate" 
                    SortExpression="album_sdate" />
                <asp:BoundField DataField="album_edate" HeaderText="album_edate" 
                    SortExpression="album_edate" />
                <asp:BoundField DataField="album_place" HeaderText="album_place" 
                    SortExpression="album_place"></asp:BoundField>
                <asp:BoundField DataField="dep_id" HeaderText="dep_id" 
                    SortExpression="dep_id" />
                <asp:BoundField DataField="type_id" HeaderText="type_id" 
                    SortExpression="type_id" />
                <asp:BoundField DataField="album_counter" HeaderText="album_counter" 
                    SortExpression="album_counter" />
                <asp:BoundField DataField="point_total" HeaderText="point_total" 
                    SortExpression="point_total" />
                <asp:BoundField DataField="vote_total" HeaderText="vote_total" 
                    SortExpression="vote_total" />
            </Columns>
            <FooterStyle BackColor="#CCCC99" />
            <PagerStyle BackColor="#F7F7DE" ForeColor="Black" 
                HorizontalAlign="Right" />
            <SelectedRowStyle BackColor="#CE5D5A" ForeColor="White" Font-Bold="True" />
            <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>
        <asp:AccessDataSource ID="AccessDataSource1" runat="server" 
            DataFile="~/photo.mdb" SelectCommand="SELECT * FROM [Album]">
        </asp:AccessDataSource>
        <br />
    </asp:Panel>
    <br />
    <br />
    <br />
    <br />
    <br />
    <br />
    </asp:Content>

<asp:Content ID="Content1" runat="server" 
    contentplaceholderid="ScriptIncludePlaceHolder">

    <script type="text/javascript" src="<%= ResolveUrl("~/jquery.js") %>"></script>
  <script type="text/javascript" src="<%= ResolveUrl("~/script.js") %>"></script>
    <style type="text/css">
        .style3
        {
            height: 41px;
        }
        .style4
        {
            width: 142px;
            height: 34px;
        }
        .style5
        {
            height: 34px;
            width: 370px;
        }
        .style6
        {
            width: 142px;
            height: 63px;
        }
        .style7
        {
            height: 63px;
            width: 370px;
        }
    </style>

</asp:Content>

<%@ Page Language="C#" MasterPageFile="~/design/MasterPage.master" ValidateRequest="false" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Untitled Page" %>