public async Task Execute() { if (Invoice == null) { throw new ArgumentNullException("Invoice boş olamaz!"); } _serviceProxy = IsNetHelper.CreateServiceProxy( ServiceInfo.ServiceUrl, ServiceInfo.UserName, ServiceInfo.Password); var request = new SendInvoiceXmlRequest() { Invoices = new[] { new InvoiceXml() { InvoiceContent = Serialization.SerializeToBytes(this.Invoice), ReceiverTag = this.ServiceInfo.ReceiverPostboxName } } }; await _serviceProxy.SendInvoiceXmlAsync(request) .ContinueWith(d => { var result = new ServiceResponse() { Hatali = false, }; if (d.IsCanceled || d.IsFaulted) { result.Hatali = true; foreach (System.Exception innerException in d.Exception.Flatten().InnerExceptions) { result.Istisna += innerException.ToString(); } } else { result.Sonuc = d.IsCompletedSuccessfully ? "İşlem başarıyla tamamlandı" : "İşlem tamamlandı!"; result.Data = new { d.Result }; } this.Result = Task.FromResult(result); }); }