const string UserName = "userName";
    const string Password = "password";
    const string ServerIp = "11.22.333.444/";

    public bool UploadFile(HttpPostedFileBase file)
    {
        string fileName = file.FileName;

        var serverUri = new Uri("ftp://" + ServerIp + fileName);


        // the serverUri should start with the ftp:// scheme.
        if (serverUri.Scheme != Uri.UriSchemeFtp)
            return false;

        try
        {
            // get the object used to communicate with the server.
            var request = (FtpWebRequest)WebRequest.Create(serverUri);

            request.EnableSsl = true;
            request.UsePassive = true;
            request.UseBinary = true;
            request.Credentials = new NetworkCredential(UserName, Password);
            request.Method = WebRequestMethods.Ftp.UploadFile;

            // read file into byte array
            var sourceStream = new StreamReader(file.InputStream);
            byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            request.ContentLength = fileContents.Length;

            // send bytes to server
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(fileContents, 0, fileContents.Length);
            requestStream.Close();

            var response = (FtpWebResponse)request.GetResponse();
            Console.WriteLine("Response status: {0}", response.StatusDescription);
        }
        catch (Exception exc)
        {
            throw exc;
        }
        return true;
    }

// you could pass the host, port, usr, and pass as parameters
    public void FileUploadSFTP()
    {
        var host = "whateverthehostis.com";
        var port = 22;
        var username = "username";
        var password = "passw0rd";

        // http://stackoverflow.com/questions/18757097/writing-data-into-csv-file/39535867#39535867
        byte[] csvFile = DownloadCSV(); // Function returns byte[] csv file

        using (var client = new SftpClient(host, port, username, password))
        {
            client.Connect();
            if (client.IsConnected)
            {
                Debug.WriteLine("I'm connected to the client");

                using (var ms = new MemoryStream(csvFile))
                {
                    client.BufferSize = (uint)ms.Length; // bypass Payload error large files
                    client.UploadFile(ms, GetListFileName());
                }
            }
            else
            {
                Debug.WriteLine("I couldn't connect");
            }
        }
    }

// you could pass the host, port, usr, pass, and uploadFile as parameters
    public void FileUploadSFTP()
    {
        var host = "whateverthehostis.com";
        var port = 22;
        var username = "username";
        var password = "passw0rd";

        // path for file you want to upload
        var uploadFile = @"c:yourfilegoeshere.txt";

        using (var client = new SftpClient(host, port, username, password))
        {
            client.Connect();
            if (client.IsConnected)
            {
                Debug.WriteLine("I'm connected to the client");

                using (var fileStream = new FileStream(uploadFile, FileMode.Open))
                {

                    client.BufferSize = 4 * 1024; // bypass Payload error large files
                    client.UploadFile(fileStream, Path.GetFileName(uploadFile));
                }
            }
            else
            {
                Debug.WriteLine("I couldn't connect");
            }
        }
    }