我想在网页母版页中使用AJAX更新面板，但它不起作用 我尝试打开另一个做同样步骤的proget，它运行良好，但在这个页面它不能工作 这是代码：
<%@ Page Title="" Language="VB" MasterPageFile="~/GIAC/Accueil/GiacMasterPage.master" AutoEventWireup="false" CodeFile="Les_Dossiers_Finance.aspx.vb" Inherits="GIAC_Gestion_des_dossiers_Les_Dossiers_Finance" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Gestion_Dossier_Finance" ContentPlaceHolderID="Corps" Runat="Server">
<center> <div id="Bar_Nav_Gestion_Dossier_Inter">
<p id="p1"><a href="Tous_Les_Dossiers.aspx">Consulter <br /> Tous les dossiers</a></p>
<ul>
<li id="li1"><a href="Les_Dossiers_Finance.aspx">Les dossiers qui sont prêts a remplir avec les information de finance</a></li>
<li id="li2"><a href="Les_Dossiers_Rembourse.aspx">Les dossiers qui sont prêts a remplir avec les information de remboursement</a></li>
<li id="li3"><a href="Prete_Envoyer_OFPPT.aspx">Les dossiers qui sont prêts a envoyer au OFPPT</a></li>
<li id="li4"><a href="Deja_Envoyer_OFPPT.aspx">Les dossiers qui sont déja envoyer a OFPPT</a></li>
<li id="li5"><a href="Retour_OFPPT.aspx">Retour de L’OFPPT </a></li>
</ul>
<p id="p2">Nouveau dossier</p>
</div></center>
<div id="BarRecherche">
Filtrer les dossiers par :
<asp:DropDownList ID="RecherhcerComboBox" runat="server" ONCHANGE="Recherche()">
<asp:ListItem Selected="True" Value="Rien">--Sélectionner le type--</asp:ListItem>
<asp:ListItem Value="CNSS">CNSS d'entreprise</asp:ListItem>
<asp:ListItem Value="Date">Date de dépôt des dossiers</asp:ListItem>
<asp:ListItem Value="ID">Identifiant d'entreprise</asp:ListItem>
</asp:DropDownList>
</div>
<asp:Panel ID="SearchPanel" runat="server">
<div id="CNSSRech">
<asp:Panel ID="PanelCNSS" runat="server" >
Saisir la CNSS :
<asp:TextBox ID="CNSSTxt" runat="server" Height="23px" placeholder="CNSS" style="font-family : Comic Sans MS, Arial, Tahoma; color:Red;"></asp:TextBox>
<asp:Button ID="RechercherCNSS" runat="server" Text="Rechercher" />
</asp:Panel>
</div>
<div id="IDRech">
<asp:Panel ID="PanelID" runat="server" >
Saisir l'identifiant d'entreprise :
<asp:TextBox ID="IDTxt" runat="server" Height="23px"
placeholder="identifiant"
style="font-family : Comic Sans MS, Arial, Tahoma; color:Red;"
Width="91px"></asp:TextBox>
<asp:Button ID="RechercherID" runat="server" Text="Rechercher" />
</asp:Panel>
</div>
<div id="DateRech">
<asp:Panel ID="PanelDate" runat="server" >
Entre :
<asp:TextBox ID="Date_Debut" runat="server">
</asp:TextBox>
Et :
<asp:TextBox ID="Date_Fin" runat="server">
</asp:TextBox>
</asp:Panel>
</div>
</asp:Panel>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div class="GridViewDiv">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
SelectCommand="SELECT * FROM [Products]"></asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ProductID"
DataSourceID="SqlDataSource1">
<Columns>
<asp:CommandField ShowSelectButton="True" />
<asp:BoundField DataField="ProductID" HeaderText="ProductID"
InsertVisible="False" ReadOnly="True" SortExpression="ProductID" />
<asp:BoundField DataField="ProductName" HeaderText="ProductName"
SortExpression="ProductName" />
<asp:BoundField DataField="SupplierID" HeaderText="SupplierID"
SortExpression="SupplierID" />
<asp:BoundField DataField="CategoryID" HeaderText="CategoryID"
SortExpression="CategoryID" />
<asp:BoundField DataField="QuantityPerUnit" HeaderText="QuantityPerUnit"
SortExpression="QuantityPerUnit" />
<asp:BoundField DataField="UnitPrice" HeaderText="UnitPrice"
SortExpression="UnitPrice" />
<asp:BoundField DataField="UnitsInStock" HeaderText="UnitsInStock"
SortExpression="UnitsInStock" />
<asp:BoundField DataField="UnitsOnOrder" HeaderText="UnitsOnOrder"
SortExpression="UnitsOnOrder" />
<asp:BoundField DataField="ReorderLevel" HeaderText="ReorderLevel"
SortExpression="ReorderLevel" />
<asp:CheckBoxField DataField="Discontinued" HeaderText="Discontinued"
SortExpression="Discontinued" />
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</asp:Content>