private void btn_Heating_Click(object sender, EventArgs e)
{
htng = new Heating();
this.Hide();
htng.Height = g_nHeight;
htng.Width = g_nWidth;
htng.Show();
}
private void btn_Heating_Click(object sender, EventArgs e)
{
htng = new Heating();
this.Hide();
htng.Show();
}