private static void infoGather_keydown(object sender,KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            if (username == null)
            {
                username = infoGather.Text;
            }
            else
            {
                password = infoGather.Text;
                if (username == "admin" && password == "admin")
                {
                    MessageBox.Show("welcome");
                }
            }
        }
    }