(C#) ASP.Net Excel & EPPlus Open Excel and Write Excel (Template)

            FileInfo template = new FileInfo(Server.MapPath(@"Xls/Template.xlsx"));
            using (var package = new ExcelPackage(template))
            {
                var workbook = package.Workbook;

                //*** Sheet 1
                var worksheet = workbook.Worksheets.First();

                // Rows1
                worksheet.Cells["A3"].Value = "Data1-1";
                worksheet.Cells["B3"].Value = "Data1-2";
                worksheet.Cells["C3"].Value = "Data1-3";
                worksheet.Cells["D3"].Value = "Data1-4";
                worksheet.Cells["E3"].Value = "Data1-5";

                // Rows2
                worksheet.Cells["A4"].Value = "Data2-1";
                worksheet.Cells["B4"].Value = "Data3-2";
                worksheet.Cells["C4"].Value = "Data3-3";
                worksheet.Cells["D4"].Value = "Data3-4";
                worksheet.Cells["E4"].Value = "Data3-5";

                package.SaveAs(new FileInfo(Server.MapPath(@"Xls/myExcel.xlsx")));
            }

            FileInfo template = new FileInfo(Server.MapPath(@"Xls/Template.xlsx"));
            using (var package = new ExcelPackage(template))
            {
                var workbook = package.Workbook;

                //*** Sheet 1
                var worksheet = workbook.Worksheets.First();

                for (int i = 3; i <= 10; i++)
                {
                    worksheet.Cells["A" + i].Value = "Data";
                    worksheet.Cells["B" + i].Value = "Data";
                    worksheet.Cells["C" + i].Value = "Data";
                    worksheet.Cells["D" + i].Value = "Data";
                    worksheet.Cells["E" + i].Value = "Data";
                }

                package.SaveAs(new FileInfo(Server.MapPath(@"Xls/myExcel.xlsx")));
            }