... e) { string error = ""; if (e.Error != null) { error = e.Error.Message; } string message = String.Format("Creazione cancellata ({0}). Errore: {1}.\r\nRisultato: {2}.\r\nUserState: {3}.", e.Cancelled, error, e.Result, e.UserState.ToString()); this.form.Invoke(_callStartedDelegate, ...