C#: Singleton pattern with quick code snippet

Objective

Singleton pattern provides a global, single instance by making the class create a single instance of itself.

Allowing other objects to access this instance through a class method that returns a reference to the instance. A class method is globally accessible.

Singleton Class Code Snippet

Declaring the class constructor as private so that no other object can create a new instance.

      using System;
      using System.Collections.Generic;
      using System.Linq;
      using System.Text;
      using System.Threading.Tasks;
              
      namespace singleton
      {  
                 public sealed  class Singleton  
                 {      
                 private static  volatile Singleton instance;  
                 private static  object syncRoot = new Object();  
                 static int  instanceCounter;  
              
              
                 private Singleton() {  
              
                 }      
              
                 public static  Singleton Instance  
                 {      
                 get      
                 {      
                 if (instance == null)  
                 {      
                 lock (syncRoot)  
                 {      
                 if (instance == null)  
                 instance =       new  Singleton();  
                 }      
                 }      
              
                 return instance;  
                 }      
                 }      
              
                 public int  getCounter()  
                 {      
                 return instanceCounter++;  
                 }      
              
                 }      
      }  

Calling class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
  
namespace singleton
{
 class Program
 {
 static void  Main(string[] args)
 {
 var counter = Singleton.Instance;
 var test = counter.getCounter();
  
 }
 }
}

 

---