public static class MyServiceClientHelp

    {

        public static TResult Using<T, TResult>(this T client, Func<T, TResult> work) where T : ICommunicationObject

        {

            try

            {

                var result = work(client);

                client.Close();

                return result;

            }

            catch (Exception e)

            {

                client.Abort();

                throw;

            }

        }

    }

var result = MyServiceClientHelp.Using

                (new IntroductionServiceClient(),

                    x => x.IntroduceAsync(new IntroductionRequest { Greeting = "hehhehe", Name = "ly" }).Result

                );

            Console.WriteLine(string.Format("{0} {1}, my name is {2}", result.Greeting, result.ClientName, result.ServiceName));