Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
The ServiceReferenceCollection object that is returned by this property is a collection of ServiceReference objects, each of which represents a Web service that is registered with the ScriptManager control . You can define services in the ScriptManager control or in an associated ScriptManagerProxy control.
You can add services to the collection in markup by adding an asp:ServiceReference element to a Services element inside the asp:ScriptManager instance on the page, as shown in the following example.
<asp:ScriptManager ID="SM1" runat="server"> <Services> <asp:ServiceReference Path="Service.asmx" /> </Services> </asp:ScriptManager>