Retrive data from multiple table using WCF service

Retrive data from multiple table using list<> in WCF service

>> Here i have two tables one is Emp and second one is Contact table
I went to retrive data from both table than i create one collection using List<> and create temp class...is name as empdetail..

[OperationContract]

    public List<Empdetail> getpiza(int id)

    {

       var s = (from a in obj.Emp

                 join b in obj.contacts on a.id equals b.Emp.id

                 where a.id == id

                 select new Empdetail

                 {

                  name= a.name,

                   city=  a.city,

                    email=b.email

                 });

        return s.ToList();

    }

    [DataContract]

    public class Empdetail

    {

        [DataMember]

        public string name { set; get; }

        [DataMember]

        public string city { set; get; }

        [DataMember]

        public string email { set; get; }

    }