Singleton Pattern implementation using Private Constructor in C#

In this article, I have tried to show the implementation of singleton pattern in C# using Private constructor. the source of this article is dofactory

using System; namespace ConsoleApplication1 {   /// <summary>   /// MainApp startup class for Structural   /// Singleton Design Pattern.   /// </summary>   class Program   {     /// <summary>     /// Entry point into console application.     /// </summary>    public  static void Main()     {       // Constructor is private-- cannot use new       Singleton s1 = Singleton.Instance(); // trick to creating object        Singleton s2 = Singleton.Instance();       // Test for same instance       if (s1 == s2)       {         Console.WriteLine("Objects are the same instance");       }       // Wait for user       Console.ReadKey();     }   }   /// <summary>   /// The 'Singleton' class   /// </summary>   class Singleton   {     private static Singleton _instance;     // Constructor is 'private'     private Singleton()     {     }     public static Singleton Instance()     {       // Uses lazy initialization.       // Note: this is not thread safe.       if (_instance == null)       {         _instance = new Singleton(); // creating the instance and guaranteeing for single instance        }       return _instance;     }   } }

Output Objects are the same instance