Bonjour, veuillez m'aider svp ca fait plus qu'une semaine que je me bas avec un probleme :
ma page master :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>EPEGA Assurances</title>
    <link type="text/css" href="default.css" rel="stylesheet" /> 
</head>
<body>
    <form id="form1" runat="server">
<asp:ToolkitScriptManager ID="scriptManager"  runat="server"><Services><asp:ServiceReference Path="~/WSCat.asmx" /></Services>
    </asp:ToolkitScriptManager>
 
<div><center>
    Solution Web de Gestion de courtage en Assurance</center></div>
<b/>
 
 
<table id="leftNav" style="HEIGHT: 500px; font-size: 12pt;border-top: 0px;" 
    cellspacing="0" cellpadding="0" width="100%">
    <tr>
        <td class = "td1" style="width: 386px"> 
            <asp:LoginStatus ID="LoginStatus1" runat="server" BackColor="Transparent" 
                Font-Bold="True" Font-Names="Arial" Font-Size="9pt" Font-Underline="False"
                LoginText="" LogoutAction="RedirectToLoginPage" LogoutText="Se déconnecter"
                Width="100%" Height="20px" />
            <br />
            &nbsp;&nbsp;
            <asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1" BackColor="Transparent" BorderColor="Transparent" Width="100%" ExpandDepth="0" ForeColor="White" Font-Names="Arial" Font-Size="10pt" Font-Strikeout="False" ImageSet="Simple" AutoGenerateDataBindings="False" EnableViewState="False" PopulateNodesFromClient="False" NodeIndent="10" OnTreeNodeDataBound="TreeView1_TreeNodeDataBound">
                <ParentNodeStyle Font-Bold="False" />
                <HoverNodeStyle Font-Underline="True" ForeColor="#DD5555" />
                <SelectedNodeStyle Font-Underline="True" ForeColor="#DD5555" HorizontalPadding="0px"
                    VerticalPadding="0px" />
                <NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="0px"
                    NodeSpacing="0px" VerticalPadding="0px" />
            </asp:TreeView>
            &nbsp;<br />
            &nbsp;
            <br />
            <br />
            <br />
            &nbsp;
            <br />
        </td>
    <td class = "td2">                
    <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server" OnPreRender="ContentPlaceHolder1_PreRender">
        &nbsp;<span style="font-size: 10pt; font-family: Arial; width: 100%; height: 100%;">&nbsp;<br />
                <br />
                <br />
        &nbsp;</span></asp:ContentPlaceHolder>
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" ShowStartingNode="False" />
        </td>
    </tr>
</table>
 
</form>
</body>
</html>
ma page default :

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<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Librairies" %>
<%@ MasterType VirtualPath="~/MasterPage.master" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
 <asp:HiddenField ID="activeTab" runat="server" />
<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server" />
    <asp:TabContainer ID="TabContainer1" runat="server" OnClientActiveTabChanged="ActiveTabChanged">
 
    <script type="text/javascript">
    function ActiveTabChanged(sender, e) {
        var activeTab = $get('<%=activeTab.ClientID%>');
        activeTab.value = sender.get_activeTabIndex();
    }
</script>
 
        <asp:TabPanel ID = "tbCategorie" runat = "server" HeaderText = "Categories">
        <HeaderTemplate>Catégories</HeaderTemplate>
                <ContentTemplate>
                     <div>
            <asp:SqlDataSource ID="sqldsCategories" runat="server" ConnectionString="<%$ ConnectionStrings:ASSURANCEConnectionString %>"
                SelectCommand="selectCategorie"
                SelectCommandType="StoredProcedure"
                UpdateCommand = "updateCategorie"
                UpdateCommandType="StoredProcedure"
                InsertCommand = "insertCategorie"
                InsertCommandType="StoredProcedure">
 
                <UpdateParameters>
			        <asp:Parameter Name= "Categorie" Type="String" />
			        <asp:Parameter Name = "idCategorie" Type = "Int16" />
		        </UpdateParameters>
		        <InsertParameters>
                    <asp:Parameter Name= "Categorie" Type="String" />
			        <asp:Parameter Name = "idCategorie" Type = "Int16" />
		        </InsertParameters>
            </asp:SqlDataSource>
 
            <br />
            <asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional">
                <ContentTemplate>            
                    <asp:Label ID="lblTitle" runat="server" Text="Categories" BackColor="lightblue" Width="50%" />
                    <asp:GridView 
                        ID="gvCategories" runat="server" DataKeyNames="idCategorie" AutoGenerateColumns="false" 
                        AllowPaging="true" AllowSorting="true" PageSize="10" DataSourceID="sqldsCategories" Width="50%">
                        <AlternatingRowStyle BackColor="lightblue" />
                        <HeaderStyle HorizontalAlign="Left" />
                        <Columns>
                            <asp:TemplateField >
                                <ItemTemplate>
                                    <asp:ImageButton ID="btnViewDetails" runat="server"  OnClick="BtnViewDetails_Click" ImageUrl="~/images/btn_edit.gif"/>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:BoundField DataField="idCategorie" HeaderText="ID" SortExpression="idCategorie" ReadOnly="true" />
                            <asp:BoundField DataField="Categorie" HeaderText="Categorie" SortExpression="Categorie" ReadOnly="true" />               
                        </Columns>                    
                    </asp:GridView>
                    <asp:LinkButton ID="lkAjouter" runat="server" OnClick="lkAjouter_Click">Ajouter</asp:LinkButton>
                </ContentTemplate>
            </asp:UpdatePanel>                    
            &nbsp;
 
            <asp:Button id="btnShowPopup" runat="server" style="display:none" />&nbsp;
 
            <asp:ModalPopupExtender 
                ID="mdlPopup" runat="server" TargetControlID="btnShowPopup" PopupControlID="pnlPopup" 
                CancelControlID="btnClose" BackgroundCssClass="modalBackground" />
 
            <asp:Panel ID="pnlPopup" runat="server" style="display:none; Width:80%" CssClass="modalBox" >
                <asp:UpdatePanel ID="updPnlCategorieDetail" runat="server" UpdateMode="Conditional">
                    <ContentTemplate>
                        <br />
                        <asp:Panel ID="PersonCaption" runat="server" CssClass="caption" Style="margin-bottom: 10px; cursor: hand;">Detail Categorie</asp:Panel>
 
                        <asp:HiddenField ID="hidCategorieEditIndex" runat="server" Value="-1" />
                        <div class="divCol"> Categorie :</div>
				        <div class="divColLast">
					        <asp:TextBox ID="txtCategorie" runat="server" MaxLength="64" Width="250" ></asp:TextBox>
				        </div>
 
				    <div class="clearer"></div>
                    </ContentTemplate>                
                </asp:UpdatePanel>
                &nbsp;
                <div style="width:50%;">
                    <asp:Button ID="btnSave" runat="server" OnClientClick="btnSave_Click" Text="Save"
                        Width="50px" OnClick="btnSave_Click" />
                    <asp:Button ID="btnClose" runat="server" Text="Close" Width="50px" />
                </div>             
            </asp:Panel>
 
        </div>
                </ContentTemplate>
        </asp:TabPanel>
 
    </asp:TabContainer>
 
 
</asp:Content>
la page s'affiche a 80% correctement

mais sur la partie design a chaque fois il me fais resortir une erreur parfois :

impossible de définir '0' pour la propriété 'ActiveTabIndex'
impossible de définir la propriété HeaderText
et rien n'est affiché

Je sais qu'est ce qui m'echappe:

Merci.