ASP.NET

Dim dwnURL As String = CType(sender, LinkButton).CommandArgument<br />
        If dwnURL.Length > 0 Then<br />
            Dim filepath As String<br />
            filepath = System.Web.Hosting.HostingEnvironment.MapPath(dwnURL)<br />
            'Check whether the download file exists or not. if does not exists, send auto-generated email to the admin specificying<br />
            'the at which URL it occured and the file which is not found.<br />
            If Not System.IO.File.Exists(filepath) Then<br />
                Session("FNN_AbsolutePath") = filepath<br />
                Session("BackURL") = Request.UrlReferrer<br />
                Response.Redirect("~/BrokenLink.aspx")<br />
            End If<br />
            Dim onlyFileName As String = System.IO.Path.GetFileName(filepath)<br />
            ' Open File<br />
            If Not System.IO.File.Exists(filepath) Then<br />
                ' popFileNotFound.Link = "" ' ResolveUrl("~/admin/email.aspx")<br />
                'popNewMail.Title = GetGlobalResourceObject("mail", "newMail")<br />
                ' popNewMail.Message = String.Format(GetGlobalResourceObject("mail", "newMailMessage"), _newMailCount.ToString())<br />
                popFileNotFound.AutoShow = True<br />
                popFileNotFound.Visible = True<br />
                Exit Sub<br />
            End If<br />
            Dim fs As New IO.FileStream(filepath, IO.FileMode.Open)<br />
            Dim bytes(fs.Length) As Byte<br />
            fs.Read(bytes, 0, fs.Length)<br />
            fs.Close()<br />
            ' Send the file as Response<br />
            Response.AddHeader("Content-disposition", "attachment; filename=" & onlyFileName)<br />
            Response.ContentType = "application/octet-stream"<br />
            Response.BinaryWrite(bytes)<br />
            Response.End()<br />
        End If