FTP, send concurrent file

namespace FTP
{
    public partial class Form1 : Form
    {
       string MyServerIP;
        string MyUserID;
        string MyPassword;
        string MyFilename;

        private Thread Threadx1 = null;
        private Thread Threadx2 = null;

        public Form1()
        {
            InitializeComponent();

            Threadx1 = new Thread(new ThreadStart(Thread1));
            Threadx1.IsBackground = true;

            Threadx2 = new Thread(new ThreadStart(Thread2));
            Threadx2.IsBackground = true;
        }

        public void Thread1()
        {
            MyServerIP = "127.0.0.1";
            MyUserID = "user1";
            MyPassword = "user1";
            MyFilename = "C:\\a.txt";
            Upload(MyServerIP,MyUserID,MyPassword,MyFilename);
        }

        private void Thread2()
        {
            MyServerIP = "127.0.0.1";
            MyUserID = "user2";
            MyPassword = "user2";
            MyFilename = "C:\\a.txt";
            Upload(MyServerIP,MyUserID,MyPassword,MyFilename);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Threadx1.Start();
            Threadx2.Start();
        }

    }
}