Call server side method using javascript

ServerSide Method:-

System.Web.Services.WebMethod]

public static string SetDownloadPath(string ID)
{
HttpContext.Current.Session["logo"] = ID;
return ID;
}

Javascript To Call:-

PageMethods.SetDownloadPath(id);

Need To change in Following:-

<cc1:ToolkitScriptManager ID="ScriptManager1" runat="server" ScriptMode="Release"
EnablePageMethods="true">

</cc1:ToolkitScriptManager>

EnablePageMethods="true"

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