c# - Page Methods throwing Undefined -

i trying use page methods call function , getting "pagemethods undefinded" error. have used them before whilst using c# not vb i'm wondering if syntax wrong examples can find c#. wondering if it's because scriptmanager on master page?

i've read error everywhere have appears correct!

can point me @ doing wrong?

thanks!

my code:

part of master page

<form id="form1" runat="server"> <asp:scriptmanager id="scriptmanager1" runat="server" enablepartialrendering="true"  enablepagemethods="true" > </asp:scriptmanager> <div id="header">~~~~~ 

content page html

  <asp:content id="content1" contentplaceholderid="head" runat="server"> <script type="text/javascript">         function selectzones(commaseparatedlist){             pagemethods.zones(commaseparatedlist);         }     </script> </asp:content> <asp:content id="content2" contentplaceholderid="navigationplaceholder" runat="server"> </asp:content> <asp:content id="content3" contentplaceholderid="contentbodyplaceholder" runat="server">  <a href='' onclick='selectzones("blah,blah,blah"); return false;'>click here</a> </asp:content> <asp:content id="content4" contentplaceholderid="functionsmenuplaceholder" runat="server"> </asp:content> 

content page code behind

    imports system.web.services  public class testclass     inherits baseclass      protected sub page_load(byval sender object, byval e system.eventargs) handles me.load      end sub      <webmethod()>     protected shared sub zones(byval zones string)         httpcontext.current.response.write("test = " & zones)     end sub end class 

i believe have issue "selectzones" method running before scripts script manager completing run. suggest try put call document ready or event , see if call works @ time. scripts run when seen client browser, , if downloaded script manager other scripts later in page run first.