static void Main(string[] args) { ExcelManager em = new ExcelManager(@"c:\\Test.xlsx"); em.FillCell(1, 2, "Jan"); em.FillCell(1, 3, "Feb"); em.FillCell(1, 4, "Mar"); em.FillCell(2, 1, "Boston"); em.FillCell(3, 1, "New York"); em.Save(); }