Binaryworld - DownloadFile - Send a file to the client browser ... [ ASP.net -> General ]

' Open the standard dialog to download a file located on the server
' whose virtual path is passed as an argument. This routine is useful when
' you want to download a file that is otherwise processed by IIS.

' This routine must be included in an asp.net page, so that it can access
' the Server and Response objects.

Sub DownloadFile(ByVal virtualPath As String)
  ' retrieve the physical path of the file to download, and create
  ' a FileInfo object to read its properties
  Dim FilePath As String = Server.MapPath(virtualPath)
  Dim TargetFile As New System.IO.FileInfo(FilePath)

  ' clear the current output content from the buffer
  Response.Clear()
  ' add the header that specifies the default filename for the Download/
  ' SaveAs dialog
  Response.AddHeader("Content-Disposition", "attachment; filename=" + _
    TargetFile.Name)
  ' add the header that specifies the file size, so that the browser
  ' can show the download progress
  Response.AddHeader("Content-Length", TargetFile.Length.ToString())
  ' specify that the response is a stream that cannot be read by the
  ' client and must be downloaded
  Response.ContentType = "application/octet-stream"
  ' send the file stream to the client
  Response.WriteFile(TargetFile.FullName)
  ' stop the execution of this page
  Response.End()
End Sub