private void button2_Click(object sender, EventArgs e) { files = null; files = Directory.GetFiles("D:\\ITIM\\EVEX", "*.xlsx", SearchOption.AllDirectories); ListPL.Clear(); foreach (string file in files) { if (file.Contains("_PL_") && !file.Contains("kopie")) { ListPL.Add(new ProjectListWS(new ExcelPackage(new FileInfo(file)))); } } ExcelUtils eUt = new ExcelUtils(); foreach (ProjectListWS pl in ListPL) { PLParser plParser = new PLParser(pl.getPList().Workbook); } }