protected async override void OnAppearing() { base.OnAppearing(); DataTable dt = new DataTable(); BackupHandler edf = new BackupHandler(); var temp = (measunit)BindingContext; using (var stream = await FileSystem.OpenAppPackageFileAsync("MEASUNIT.EDF")) { using (var reader = new StreamReader(stream)) { dt = edf.readEDF(reader); reader.Close(); } stream.Close(); } }