FTP through FTP proxy

I am trying to download a file using FTP through a FTP proxy (on my side). This is script I am trying to implement in C#:

On Commandline:
ftp -i -s:get.ini CORPORATE_PROXY.com
cd pub/linux/knoppix
get packages.txt
abc/user_name is my user name who was granted by permissions to FTP through my corporate proxy.

I want to implement above script in C#, but after playing with many types of code found on Internet I cannot do that.

FtpWebRequest request = FtpWebRequest.Create(new Uri(@“ftp://” + CORPORATE_PROXY.com + @"/" + Path.GetFileName(fileToUpload))) as FtpWebRequest;
request.UseBinary = true;
request.KeepAlive = false;
request.Method = WebRequestMethods.Ftp.UploadFile;
if (!string.IsNullOrEmpty(CORPORATE_PROXY_USER) && !string.IsNullOrEmpty(CORPORATE_PROXY_PASSWORD ))
request.Credentials = new NetworkCredential(CORPORATE_PROXY_USER, CORPORATE_PROXY_PASSWORD );

//Get physical file
FileInfo fi = new FileInfo(fileToUpload);
Byte[] contents = new Byte[fi.Length];

//Read file
FileStream fs = fi.OpenRead();
fs.Read(contents, 0, Convert.ToInt32(fi.Length));

request.Proxy = new WebProxy(“CLIENT_FTP.com”);
request.Proxy.Credentials = new NetworkCredential(abc/user_name, user_name_password);

//Write file contents to FTP server
Stream rs = request.GetRequestStream();
rs.Write(contents, 0, Convert.ToInt32(fi.Length));

FtpWebResponse response = request.GetResponse() as FtpWebResponse;
string statusDescription = response.StatusDescription;
return statusDescription;
The main problem is that for the proxy I am using WebProxy, while I suspect I should use FTPProxy - which I cannot find anythere? Any ideas which direction should I go, or maybe WebProxy is fine?