In the context menu for the service reference in the ASP.NET project, select the Configure Service
Reference command, and set the collection type to System.Collections.Generic.List.
In the context menu for the service reference in the ASP.NET project, select the Update Service Reference command to retrieve the new service configuration.
Change the service interface and implementation to return a List<Person>
Edit the address property of the endpoint element in the web.config file to use the new service address.