Getting the session in javascript using page methods is not working ?

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ASP.NET

Javascript

Hi all ,

I am trying to get the value inside a session from javascript and alerting the value,but the alert is giving "undefined" so what is my mistake ?

Here is my code :

<script runat="server">

       <WebMethod()> _
       Public Shared Function Sessions(ByVal key As String) As String
           Return DirectCast(HttpContext.Current.Session(key), String)
       End Function

   </script>

function pageLoad(sender, arg) {
            Language = PageMethods.Sessions("Lang", OnCallComplete, OnCallError);
        }

        function OnCallComplete(result, userContext, methodName) {
            alert(Language);
        }

        function OnCallError(error, userContext, methodName) {
            if (error !== null) {
                alert(error.get_message());
            }
        }

Please help .