C# Online Compiler | .NET Fiddle

using System;
 
namespace FacadeSample
{
  /// <summary>
  /// MainApp startup class for Structural
  /// Facade Design Pattern.
  /// </summary>
  public class MainApp
  {
    /// <summary>
    /// Entry point into console application.
    /// </summary>
    public static void Main()
    {
      IAnalyticsFacade facade = new AnalyticsFacade();
 
		EventData edata = new EventData ();
		edata.data = "It is sample Data";
		edata.id = 1;
        facade.WriteEvent(edata);
 
	    Console.WriteLine(facade.ReadEvent(1).data);
	}
  }

public class AnalyticsFacade : IAnalyticsFacade {
	
	private IAnalyticsFacade _Cloud;
	private IAnalyticsFacade _Splunk;
	
	//Enable system based on your needs
	bool enableSplunk = false;
	bool enableCloud = true;
	
    public AnalyticsFacade()
	{
		_Cloud = enableCloud ? new Cloud() : null;
		_Splunk = enableSplunk ? new Splunk() : null;
	}
	
    public bool WriteEvent(EventData data){
		
		if (_Splunk != null )
		     return _Splunk.WriteEvent(data);
		if (_Cloud != null )
		     return _Cloud.WriteEvent(data);
		return false;
	}
			
    public EventData ReadEvent(int id) {
		
	 if (_Splunk != null )
		     return _Splunk.ReadEvent(id);
		if (_Cloud != null )
		     return _Cloud.ReadEvent(id);
		return null;
	}
}

public interface IAnalyticsFacade {
	
    bool WriteEvent(EventData data);
	EventData ReadEvent(int id);
	
}

public class EventData {
		
			public string data  { get; set;}
			public int id { get; set;}			
}

class Splunk : IAnalyticsFacade {
	
	public bool WriteEvent(EventData data){return true;}
	public EventData ReadEvent(int id) { return new EventData { data = "Data from Splunk", id=1};}
	
}
class Cloud : IAnalyticsFacade {
	
	public bool WriteEvent(EventData data){return true;}
	public EventData ReadEvent(int id) { return new EventData { data = "Data from Cloud", id=1};}
	
}
}

    public EventData ReadEvent(int id) { return new EventData { data = "Data from Splunk", id=1};}
 
using System;
 
namespace FacadeSample
{
  /// <summary>
  /// MainApp startup class for Structural
  /// Facade Design Pattern.
  /// </summary>
  public class MainApp
  {
    /// <summary>
    /// Entry point into console application.
    /// </summary>
    public static void Main()
    {
      IAnalyticsFacade facade = new AnalyticsFacade();
 
        EventData edata = new EventData ();
        edata.data = "It is sample Data";
        edata.id = 1;
        facade.WriteEvent(edata);
 
        Console.WriteLine(facade.ReadEvent(1).data);
    }