FTP upload code

using System;
using System.IO;
using System.Net;

public class Program
{
    public static void Main(string[] args)
    {
        //settings for the program to run...
        string uploadFile = string.Empty;
        string FTPServer = string.Empty;
        string FTPUser = string.Empty;
        string FTPPassword = string.Empty;

        if(args.Length != 4) //check if the parameters were set...
        {
            Console.WriteLine("Not all parameters were provided, please enter fields manually...");

            Console.WriteLine("Please enter the server IP: ");
            FTPServer = Console.ReadLine();

            Console.WriteLine("Please enter the FTP username: ");
            FTPUser = Console.ReadLine();

            Console.WriteLine("Please enter the FTP Password: ");
            FTPPassword = Console.ReadLine();

            Console.WriteLine("Please enter the file path to upload: ");
            uploadFile = Console.ReadLine();
        }
        else
        {

            //Get the command line arguements
            FTPServer = args[0];
            FTPUser = args[1];
            FTPPassword = args[2];
            uploadFile = args[3];
        }

        using(FileStream fs = File.OpenRead(uploadFile))
        {
            FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(FTPServer + "/" + uploadFile);
            ftp.Credentials = new NetworkCredential(FTPUser, FTPPassword);
            ftp.Timeout =  -1; //no timeout for big files...
            ftp.KeepAlive = true;
            ftp.UseBinary = true;
            ftp.Method = WebRequestMethods.Ftp.UploadFile;

            fs.CopyTo(ftp.GetRequestStream()); //upload the file

            //Close the stream cause the upload is done...
            ftp.GetRequestStream().Close();
        }
    }
}