static void Main(string[] args) { HelloServiceClient wcfClient = new HelloServiceClient(); CompositeType obj = new CompositeType(); obj.BoolValue = true; obj.StringValue = "Hello WCF TCP client!"; CompositeType objret = wcfClient.GetDataUsingDataContract(obj); Console.WriteLine("GetDataUsingDataContract returns: " + objret.StringValue); Console.ReadLine(); wcfClient.Close(); }