.net - calling serverside method from javascript -

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want call server side c# function javascript.

i used way given in this article.

this works fine when did same steps in new asp.net application.
when repeat same steps in application on working give error:

"pagemethods undefined".

i working on .net 4.0.

have enabled page methods on scriptmanager?

<asp:scriptmanager id="scriptmanager1" enablepagemethods="true" runat="server" />


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