C# Online Compiler | .NET Fiddle

using System;

public interface IDevice
{
    void TurnOn();
    void TurnOff();
    void SetChannel(int number);
}
public class SonyTV : IDevice
{
    public void SetChannel(int number)
    {
        Console.WriteLine("SonyTV Set Channel");
    }

    public void TurnOff()
    {
        Console.WriteLine("SonyTV Turn Off");
    }

    public void TurnOn()
    {
        Console.WriteLine("SonyTV Turn On");
    }
}
public class SamsungTV: IDevice
{
    public void SetChannel(int number)
    {
        Console.WriteLine("SamsungTV Set Channel");
    }

    public void TurnOff()
    {
        Console.WriteLine("SamsungTV Turn Off");
    }

    public void TurnOn()
    {
        Console.WriteLine("SamsungTV Turn On");
    }
}
public class RemoteControl
{
    protected IDevice device;

    public RemoteControl(IDevice device)
    {
        this.device = device;
    }

    public void TurnOn()
    {
        device.TurnOn();
    }
    public void TurnOff()
    {
        device.TurnOff();
    }
}
public class AdvancedRemoteControl : RemoteControl
{
    public AdvancedRemoteControl(IDevice device) : base(device)
    {
    }

    public void SetChannel(int number)
    {
        device.SetChannel(number);
    }
}
					
public class Program
{
	public static void Main()
	{
		var remoteControl = new AdvancedRemoteControl(new SamsungTV());
		remoteControl.TurnOn();
	}
}

        var remoteControl = new AdvancedRemoteControl(new SamsungTV());
 
using System;
​
public interface IDevice
{
    void TurnOn();
    void TurnOff();
    void SetChannel(int number);
}
public class SonyTV : IDevice
{
    public void SetChannel(int number)
    {
        Console.WriteLine("SonyTV Set Channel");
    }
​
    public void TurnOff()
    {
        Console.WriteLine("SonyTV Turn Off");
    }
​
    public void TurnOn()
    {
        Console.WriteLine("SonyTV Turn On");
    }

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