MVC通过NPOI.dll导出word文档

public ActionResult ExportData()
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1");
IRow row = null;
ICell cell = null;
row = sheet.CreateRow(0);
cell = row.CreateCell(0);
cell.SetCellValue("数字");
for (int i = 0; i <= 12; i++)
{
row = sheet.CreateRow(i);
cell = row.CreateCell(0);
cell.SetCellValue(i);
}
string fileName ="20160101.xls";
MemoryStream ms = new MemoryStream();
workbook.Write(ms);
return File(ms.ToArray(), "application/ms-excel", fileName);
}