Добре, няма да рафинирам нещата до няква теоретична постановка, направо ви пляскам кода от проекта.

        public bool GetUserSubscribeMethod(User user)

        {

            if (user == null)

                throw new ArgumentException(ContractConstants.QelloService.BILLING_USER_STATUS);



            bool result = false;

            string req_params = "token=" + user.Token.AccessToken;

            AutoResetEvent eventCompleted = new AutoResetEvent(false);



            Thread thread = new Thread(start =>

            {

                PostJsonRequest<UserSubscribeStatus>(ContractConstants.QelloService.BILLING_USER_STATUS, req_params, response =>

                {

                    if ((response.Error == null) && (response.Data != null))

                    {

                        result = true;



                        if ((response.Data.ActiveRecurring != null) &&

                            (response.Data.ActiveRecurring.Length > 0))

                        {

                            user.PaymentMethod = response.Data.ActiveRecurring[0].Trim();

                            user.SubscribeStatus.IsSubscribed = user.PaymentMethod != "";

                        }

                    }



                    eventCompleted.Set();

                });

            });

            

            thread.Start();

            eventCompleted.WaitOne();



            return result;

        }