How to download file in another page and close in asp.net ?

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VB

Hi
I have to download file in another page ,i mean if click link button in default.aspx page ,open download.aspx page in page load i call the function for download

Private Sub DownloadFile(ByVal fullpath As String, ByVal forceDownload As Boolean)
       '    Dim path As Path
       Dim name = Path.GetFileName(fullpath)
       Dim ext = Path.GetExtension(fullpath)
       Dim type As String = ""

       If Not IsDBNull(ext) Then
           ext = LCase(ext)
       End If

       Select Case ext
           Case ".htm", ".html"
               type = "text/HTML"
           Case ".txt"
               type = "text/plain"
           Case ".doc", ".rtf"
               type = "Application/msword"
           Case ".csv", ".pdf"
               type = "Application/pdf"
           Case ".zip", ".ZIP"
               type = "Application/zip"
           Case ".zip", ".csv"
               type = "text/csv"
           Case Else
               type = "text/plain"
       End Select


       ''Dim req As New WebClient
       ''Dim response As HttpResponse
       ''response = HttpContext.Current.Response
       ''response.Clear()
       ''response.ClearContent()
       ''response.ClearHeaders()
       ''response.Buffer = True
       ''response.AddHeader("Content-Disposition", "attachment; filename=" + name)
       ''response.ContentType = "application/octet-stream"
       ' ''response.BinaryWrite(Buffer)
       ''response.Flush()
       ''response.End()

       If (forceDownload) Then
           Response.AppendHeader("content-disposition", "attachment; filename=" + name)
       End If
       If type <> "" Then
           Response.ContentType = type
       End If

       Response.WriteFile(fullpath)
       Response.Flush()
       Response.End()
   End Sub

The above code is download and close page,it will work in ie9,mozila and chrome but in IE8 not work.i use comment code also but not work.

pls reply asap
Regards
Aravind