[DataContract]
    public class Tester
    {
        private string name;
        private int age;

        public Tester(string n, int a)
        {
            name = n;
            age = a;
        }

        [DataMember(IsRequired = true)]
        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        [DataMember(IsRequired = true)]
        public int Age
        {
            get
            {
                return age;
            }
            set
            {
                age = value;
            }
        }
    }