Page execution / lifecycle stops after Response.TransmitFile

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C#

VB

ASP.NET

.NET

Hi
I have a gridview and a download button for each and every row.
the page objective is to list out all the records related to physical files, and when download button clicked it should download and open the downloaded file. the files are in 'pdf' format.

The page is coded and everything is going fine. I want to rebind the gridview when the file got downloaded. but after download, the rest of the page's execution or lifecycle is not being done.

it seems the issue is with page handlers. I tried searching over the internet, but unfortunately no solution found. I request you experts please help me in this issue.
and my code is like below.

Dim archiveLG() As String = fileName.Split("-")
                Hos.ArchiveLG(archiveLG(0).Substring(1), archiveLG(1).Replace(".pdf", ""))

                grdLGs.DataBind()

Dim outputStream As FileStream = New FileStream((Server.MapPath("../ScannedDoc") + ("\\" + fileName)), FileMode.Create)
                    reqFTP = CType(FtpWebRequest.Create(New Uri(DataDirectory + "InternalDocuments/" + folderName + "/" + fileName)), FtpWebRequest)

                    reqFTP.Method = WebRequestMethods.Ftp.DownloadFile
                    reqFTP.UseBinary = True
                    reqFTP.Credentials = New NetworkCredential(uid, pwd)
                    Dim ftpresponse As FtpWebResponse = CType(reqFTP.GetResponse, FtpWebResponse)

                    Dim ftpStream As Stream = ftpresponse.GetResponseStream
                    Dim cl As Long = ftpresponse.ContentLength
                    Dim bufferSize As Integer = 2048
                    Dim readCount As Integer
                    Dim buffer() As Byte = New Byte((bufferSize) - 1) {}
                    readCount = ftpStream.Read(buffer, 0, bufferSize)

                    While (readCount > 0)
                        outputStream.Write(buffer, 0, readCount)
                        readCount = ftpStream.Read(buffer, 0, bufferSize)

                    End While
                    ftpStream.Close()
                    outputStream.Close()
                    ftpresponse.Close()

                    Dim responseFile As String = Server.MapPath("../ScannedDoc") + ("\\" + fileName)
                    Response.ContentType = "application/pdf"
                    Response.AppendHeader("Content-Disposition", ("attachment; filename=" + fileName))
                    Response.TransmitFile(responseFile)
                    Response.Flush()

Thanks in advance.
Sri