新手发问，高手请进：如何使用asp.net实现xls文件的下载？

我用了如下代码（从网上抄的），但是打不开，在服务器端都打不开，但是每次文件确实有改变，请高手指教。

Sub exportbutton_click(sender As Object, e As System.Web.UI.ImageClickEventArgs)

Dim oExcel As New Excel.Application 　

Dim oBooks As Excel.Workbooks, oBook As Excel.Workbook

Dim oSheets As Excel.Sheets, oSheet As Excel.Worksheet 　

Dim oCells As Excel.Range 　

Dim sFile As String, sTemplate As String 　 　'定义一个datatable 　 　

Dim dt As DataTable = CType(session("nowds").tables(session("table")), DataTable) 　sFile=Server.MapPath(Request.ApplicationPath) & "/temp/MyExcel.xls" 　

sTemplate = Server.MapPath(Request.ApplicationPath) & "/temp/MyTemplate.xls" 　　

　oExcel.Visible =true 　oExcel.UserControl = true 　

oExcel.DisplayAlerts =false 　'定义一个新的工作簿 　

oBooks = oExcel.Workbooks 　

oBooks.Open(Server.MapPath(Request.ApplicationPath) & "/temp/MyTemplate.xls") 　

oBook = oBooks.Item(1) 　

oSheets = oBook.Worksheets 　

oSheet = CType(oSheets.Item(1), Excel.Worksheet) 　

'命名该sheet 　oSheet.Name = "用水指标" 　

oCells = oSheet.Cells 　'调用dumpdata过程，将数据导入到Excel中去 　

DumpData(dt, oCells) 　'保存 　 　 　 　

oSheet.SaveAs(sFile) 　

oBook.Close() 　

'退出Excel，并且释放调用的COM资源 　

oExcel.Quit() 　

ReleaseComObject(oCells) : ReleaseComObject(oSheet) 　ReleaseComObject(oSheets) : ReleaseComObject(oBook) 　ReleaseComObject(oBooks) : ReleaseComObject(oExcel) 　

oExcel = Nothing : oBooks = Nothing : oBook = Nothing 　oSheets = Nothing : oSheet = Nothing : oCells = Nothing 　

System.GC.Collect() 　

Response.Redirect(sFile)

 End Sub

'将DATATABLE的内容导出到Excel的单元格中去

Private Function DumpData(ByVal dt As DataTable, ByVal oCells As Excel.Range) As String 　

Dim dr As DataRow, ary() As Object 　

Dim iRow As Integer, iCol As Integer 　'输出列标题 　 　　　

oCells(2, 1) = "用水类型" 　　　　

oCells(2, 3) = "一般标准" 　　　

　oCells(2, 4) = "计算采用值" 　　

　'将数据导出到相应的单元格 　

For iRow = 0 To dt.Rows.Count - 1 　　

dr = dt.Rows.Item(iRow) 　　

ary = dr.ItemArray 　　

For iCol = 0 To UBound(ary) 　　　

oCells(iRow + 3, iCol + 1) = ary(iCol).ToString 　　

　Response.Write(ary(iCol).ToString & vbTab)

Next 　

Next

End Function

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