DesignPattern_Creational_Singleton

namespace DesignPattern.Creational.Singleton
{
    public class Singleton
    {
        private Singleton() { }
        private static Singleton _instance;
        private static readonly object Obj = new object();

        public static Singleton GetInstance()
        {
            if (_instance == null)
            {
                lock (Obj)
                {
                    if (_instance == null)
                    {
                        _instance = new Singleton();
                    }
                }
            }
            return _instance;
        }
    }

    public class NSingleton
    {
        public static readonly NSingleton Instance = new NSingleton();
    }
}