namespace WcfEchoService
{
    // NOTE: If you change the interface name "IService1" here, you must also update the reference to "IService1" in Web.config.
    [ServiceContract]
    public interface IEchoService
    {

        [OperationContract, ProtoBehavior]
        string Echo(string value);

        [OperationContract, ProtoBehavior]
        string EchoNull();

        [OperationContract, ProtoBehavior]
        CompositeType[] EchoData(CompositeType[] value);
    }


    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    [DataContract]
    [ProtoContract]
    public class CompositeType
    {


        [ProtoMember(1)]
        public bool BoolValue
        {
            get;
            set;
        }
        [ProtoMember(2)]
        public string StringValue
        {
            get;
            set;
        }
    }
}

#region IEchoService Members

    public EchoServiceClient() : base(new HttpBasicTransport("my service URI"))
    {

    }

    public string Echo(string value)
    {
        return (string)this.Invoke("Echo", value);
    }

    public string EchoNull()
    {
        return (string)this.Invoke("EchoNull");
    }

    public CompositeType[] EchoData(CompositeType[] value)
    {
        return (CompositeType[])this.Invoke("EchoData", value);
    }

    #endregion
}

class Program
{
    static void Main(string[] args)
    {
        EchoServiceClient client = new EchoServiceClient();
        Console.WriteLine(client.EchoNull());
    }
}