c# ile ftp upload webclient

private static void Upload(string ftpServer, string userName, string password, string filename)
{
   using (System.Net.WebClient client = new System.Net.WebClient())
   {
      client.Credentials = new System.Net.NetworkCredential(userName, password);
      client.UploadFile(ftpServer + "/" + new FileInfo(filename).Name, "STOR", filename);
   }
}

Metod:

Upload("ftp://ftpserver.com", "TheUserName", "ThePassword", @"C:\file.txt");