Identifier expected error javascript in aspx page while reading key value from web.config

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ASP.NET

Javascript

web.config

I am trying to read key value from web.config using javascript in my .aspx page. This page is included in a master page, the script block is added in the ContentPlaceHolder tag in my aspx page as below; This question was asked before here asp.net - how to read values from web.config in javascript in aspx page - Stack Overflow[^] but there was no clear solution. Someone suggested returning to server side but I am trying to avoid returning to server in order to accelerate user's work on the page ... So below is my code:

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
        <script type="text/javascript">

        function CheckCountry() {
          var country =   '<%=System.Configuration.ConfigurationManager.AppSettings["LoginCountry"].ToString() %>';
          alert(country);
       }

       window.onload = CheckCountry; 

       </script>       
   </asp:Content>

But whenever I try to run my project I get this error (Identifier expected ) in the List Error box in visual Studio 2010. What could be the problem? How can I solve this and get the value of country from web.config in my aspx page?

What I have tried:

I have tried also this

'<%=ConfigurationManager.AppSettings["LoginCountry"].ToString() %>'

but didn't work, same error was thrown ...