static void Main(string[] args)
{
WidescreenTV tv = new WidescreenTV();
tv.TurnOn();
tv.IncreaseVolume();
tv.DecreaseVolume();
tv.TurnOff();
TV tv2 = new TV();
tv2.TurnOn();
tv2.IncreaseVolume();
tv2.DecreaseVolume();
tv2.TurnOff();
Console.ReadLine();
}