private void buttonX2_Click(object sender, EventArgs e)
{
this.SaveConfig("sqlServerIPAddress", ip_serverip.Text);
this.SaveConfig("sqlServerPort", int_port.Text);
this.SaveConfig("dbUsername", tb_username.Text.Trim());
this.SaveConfig("dbPassword", SysUtil.EncryptDES(tb_password.Text, "quality"));
ConfigurationManager.RefreshSection("appSettings");
frm_login login = new frm_login();
login.Show();
this.Close();
}