using System; 
public abstract class Light
{
   public abstract void TurnOn();
   public abstract void TurnOff();
}
 
public class BulbLight : Light
{
   public override void TurnOn()
    {
      Console.WriteLine("Bulb Light is Turned on");
   }
 
   public override void TurnOff()
    {
      Console.WriteLine("Bulb Light is Turned off");
   }
}
 
public class TubeLight : Light
{
   public override void TurnOn()
    {
      Console.WriteLine("Tube Light is Turned on");
   }
 
   public override void TurnOff()
    {
      Console.WriteLine("Tube Light is Turned off");
   }
}
 
public class LightSimpleFactory
{
   public Light Create(string LightType)
    {
      if(LightType == "Bulb")
         return new BulbLight();
      else if(LightType == "Tube")
         return new TubeLight();
      else
         return null;
   }
}
 
public class Client
{
   public static void Main()
    {
      LightSimpleFactory lsf = new LightSimpleFactory();
 
      Light l = lsf.Create("Bulb");
      l.TurnOn();
      l.TurnOff();
 
      Console.WriteLine("-----------------");
 
      l = lsf.Create("Tube");
      l.TurnOn();
      l.TurnOff();
   }
}