protected void btnExcel_Click(object sender, EventArgs e) { var todos = PaisAppService.ObterTodos(); ManualMapper.PaisMapper mapper = new ManualMapper.PaisMapper(); var paisesDTO = mapper.MapDTO(todos); var excelExport = new ExcelExport("teste.xlsx"); excelExport.CreateInMemory(paisesDTO, "Teste123"); Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; Response.AddHeader("content-disposition", "attachment; filename=DetailReport.xlsx"); Response.BinaryWrite(excelExport.GetByteArray()); }