刷新ModalPopupExtender中的文本框

Question

我使用 AjaxModalPupupExtender 时出现问题。当我尝试刷新文本框时出现此错误：

  

＆＃34;解析器错误消息：键入＆＃39; AjaxControlToolkit.ToolkitScriptManager＆＃39;   没有名为＆＃39; script＆＃39;。＆＃34;

的公共财产

<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
            <script type="text/javascript">
                function DoCancel() {
                             $get('<%=txtEmail.ClientID%>').value = "";
                             $get('<%=txtPassword.ClientID%>').value = "";
                                     }
             </script>                                    
    </cc1:ToolkitScriptManager>

    <asp:LoginStatus ID="MasterLoginStatus" runat="server" LogoutPageUrl="Home.aspx" LogoutAction="Redirect" />

   <cc1:ModalPopupExtender ID="mpe" runat="server" PopupControlID="pnlPopupLogin" TargetControlID="MasterLoginStatus"OkControlID="btnLogin" CancelControlID="lnkButtonClose" OnCancelScript="DoCancel()" BackgroundCssClass="modalBackground"> 
   </cc1:ModalPopupExtender>

   <asp:Panel ID="pnlPopupLogin" runat="server" CssClass="modalPopup" Style="display: none">
   <div class="header">
         Sign in
         <asp:LinkButton ID="lnkButtonClose" runat="server" CssClass="boxclose" OnClick="lnkButtonClose_Click"/>
   </div>   

   <div class="body">
        Username / Email<br />
        <asp:TextBox ID="txtEmail" runat="server" CssClass="twitterStyleTextbox" placeholder="Username/Email" /> <br />

        Password <br />
<asp:TextBox ID="txtPassword" runat="server" CssClass="twitterStyleTextbox" placeholder="Password" /> <br />
    </div>     


<div class="footer">
 <asp:Button ID="btnLogin" runat="server" Text="Login" CssClass="button" />        
</div> 

 </asp:Panel>