How to upload file via FTP with SSL in ASP.NET using C#

In almost all ASP.NET web application, we have to write a code to upload file to FTP servers with SSL for security reasons.

Here is simple and full code to upload file via FTP with SSL.

It uses FtpWebRequest for creating FTP connection to server by proving FTP URL, SSL ceritifcates with necessary credentials. Below code reads the file byte by byte and upload the final stream to FTP server.

RemoteCertificateValidationCallback orgCallback = ServicePointManager.ServerCertificateValidationCallback;

ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(OnValidateCertificate);

ServicePointManager.Expect100Continue = true;

Stream requestStream = null;

FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create("FTP URL ADDRESS");

ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;

ftpRequest.Proxy = null;

ftpRequest.UseBinary = true;

ftpRequest.KeepAlive = false;

ftpRequest.EnableSsl = isSSL;

ftpRequest.UsePassive = isUsePassive;

ftpRequest.Credentials = new NetworkCredential(userName, password);

ftpRequest.UsePassive = isUsePassive;

using (requestStream = ftpRequest.GetRequestStream())

{

    const int bufferLength = 2048;

    byte[] buffer = new byte[bufferLength];

    int count = 0;

    int readBytes = 0;

    FileInfo objfileInfo = new FileInfo(completeFilePath);

    FileStream stream = objfileInfo.OpenRead();

    do

    {

        readBytes = stream.Read(buffer, 0, bufferLength);

        requestStream.Write(buffer, 0, readBytes);

        count += readBytes;

    }

    while (readBytes != 0);

}

public static bool OnValidateCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)

{

     return false;

}

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