private void WriteCheckoutDataToFile(List <VisitorsInformation> visitorList) { if (File.Exists("CheckoutsInformation.csv")) { using (Stream stream = new FileStream("CheckoutsInformation.csv", FileMode.Open, FileAccess.ReadWrite)) { var cs = new CsvChecker <VisitorsInformation>() { UseTextQualifier = true }; cs.AppendToFile(stream, visitorList, "CheckoutsInformation.csv"); } } else { using (Stream stream = new FileStream("CheckoutsInformation.csv", FileMode.Create, FileAccess.Write)) { var cs = new CsvChecker <VisitorsInformation> { UseTextQualifier = true }; cs.WriteToFile(stream, visitorList); } } }