private void button1_Click(object sender, EventArgs e)
{
client2 = new FTPClient(txt_address.Text, "/", txt_user.Text, txt_pswd.Text, 21);
new Thread(new ThreadStart(GetFile)).Start();
}
private void btn_upload_Click(object sender, EventArgs e)
{
client1 = new FTPClient(txt_address.Text, "/", txt_user.Text, txt_pswd.Text, 21);
new Thread(new ThreadStart(UploadFile)).Start();
}