singleton vs singleton CQS

F7N4-4.cs

using System;

public class Singleton {
    private static Singleton mInstance;
    private Singleton () { // Private Constructor
    }
    
    public static Singleton Instance {
        get {

            if( mInstance == null ) { 
              mInstance = new Singleton();
            }
            return mInstance;
        }
    }
    public void hi(){ Console.WriteLine("hi");}
}

public class SingletonCQS {
    private static SingletonCQS mInstance;
    private SingletonCQS () { // Private Constructor
    }
    
    public static void Create() {
      if(mInstance == null) {
        mInstance = new SingletonCQS();
      } 
    }
    public static SingletonCQS GetInstance() { 
      return mInstance;
    }
    public void hi(){ Console.WriteLine("hi");}
}

class MainClass {
  public static void Main (string[] args) {
    Singleton.Instance.hi();    

    SingletonCQS.Create();
    SingletonCQS.GetInstance().hi();
  }
}