文件夹和文件 通过 ftp C# 上传

我正在尝试学习有关通过FTP连接上传到另一台主机的新知识。我知道如何上传单个文件。但是，如果我想上传包含其完整子文件夹和文件的完整文件夹怎么办？

这是我的一个文件上传

    private void Form1_Load(object sender, EventArgs e)
    {
        Upload("Test.txt");
    }
    public void Upload(string fileToUpload)
    {
       try
        {
            FileInfo toUpload = new FileInfo(fileToUpload);
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://127.0.0.1/" + toUpload.Name);
            MessageBox.Show(WebRequestMethods.Ftp.ListDirectory);
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential("Uploader", "3635451");
            Stream ftpStream = request.GetRequestStream();
            FileStream file = File.OpenRead(fileToUpload);
            int length = 1024;
            byte[] buffer = new byte[length];
            int bytesRead = 0;
            do
            {
                bytesRead = file.Read(buffer, 0, length);
                ftpStream.Write(buffer, 0, bytesRead);
            }
            while (bytesRead != 0);
            file.Close();
            ftpStream.Close();
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

我谷歌了很多关于上传文件夹的信息，但我刚刚失败了提前谢谢你。