[Solved] PDF file from FTP Server in mobile browser downloaded as .html extension

Hello dharmendr,

I  have change my code to download pdf and it work perfectly And thank you for your response.

this the new code 

    // stream the file byte on ftp
    byte[] _downFile = DownloadFileFromFtp(pathFile);
    if (_downFile != null && _downFile.Length > 0)
    {
        string _fname = visit_no + ".pdf";
        Response.ContentType = "application/" + _fname.Split('.')[1];
        Response.AddHeader("Content-disposition", "attachment; filename=" + _fname);
        Response.OutputStream.Write(_downFile, 0, _downFile.Length);
        string str = "<div class='alert alert-success text-center alert-dismissible fade show'  role = 'alert'  style='align - content:center; justify - content:center' > The Result <strong>downloaded successfully</ strong> <button type ='button' class='close' data-dismiss='alert' aria-label='Close'><span aria-hidden='true'>&times;</span></button></div>";
        ltstatus.Text = str;
        ltstatus.Visible = true;
        Response.End();
    }


    public FtpWebRequest ConnectToFtp(string Method, string ftp)
    {
        string path = ftp;
        FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(path));
        ftpRequest.UseBinary = true;
        ftpRequest.Credentials = new NetworkCredential(username, password);
        ftpRequest.Method = Method;
        ftpRequest.Proxy = null;
        ftpRequest.KeepAlive = false;
        ftpRequest.UsePassive = false;
        return ftpRequest;    
    }

    public byte[] DownloadFileFromFtp(string ftpPath)
    {
        StringBuilder filesstring = new StringBuilder();
        WebResponse webResponse = null;
        try
        {
            FtpWebRequest ftpRequest = ConnectToFtp(WebRequestMethods.Ftp.DownloadFile, ftpPath);
            ftpRequest.UseBinary = true;
            webResponse = ftpRequest.GetResponse();
            FtpWebResponse response = (FtpWebResponse)webResponse;
            Stream dfileResponseStream = response.GetResponseStream();
            int Length = 1024;
            Byte[] buffer = new Byte[Length];
            // collect all bytes of file
            List<byte> filebytes = new List<byte>();
            int bytesRead = dfileResponseStream.Read(buffer, 0, Length);

            while (bytesRead > 0)
            {
                for (int i = 0; i < bytesRead; i++)
                    // read file byte in buffer and add it to list
                    filebytes.Add(buffer[i]);

                bytesRead = dfileResponseStream.Read(buffer, 0, Length);
            }

            response.Close();

            return filebytes.ToArray(); // return complete byte array
        }
        catch
        {
            //do any thing with exception
            return null;
        }
        finally
        {
            if (webResponse != null)
            {
                webResponse.Close();
            }
        }
    }