Serviong user file through filestream

Hi all, for security I am goign to store files outside the website, give the folder asp.net full permission and then stream the file to the user.

Code:

---

Dim fs As FileStream
    Dim strFileName As String = "testdoc.txt"
    fs = File.Open(UploadLink & strFileName, FileMode.Open)
    Dim bytBytes(fs.Length) As Byte
    fs.Read(bytBytes, 0, fs.Length)
    fs.Close()
    Response.AddHeader("Content-disposition", "attachment; filename=" & strFileName)
    Response.ContentType = "application/octet-stream"
    Response.BinaryWrite(bytBytes)
    Response.End()

---

I've set up a test page and it works perfectly in IE, FF Opera and Chrome.

My only question is how reliable is this method generally and should I expect some users to encounter issues?

Thanks Dave