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new ObjectClass()

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public class ObjectClass
{
   private ObjectClass()
    {
    }    
}

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    public class ObjectClass
    {
        private static ObjectClass singleton;
        private ObjectClass()
        {
        }

        public static ObjectClass GetSingletone()
        {
            if (singleton == null)
            {
                singleton = new ObjectClass();
            }
            return singleton;
        }
    }

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    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 0; i < 10; i++)
            {
                TestSingleton();
            }
            Console.ReadKey();
        }

        public static void TestSingleton()
        {
            Task.Factory.StartNew(new Action(() =>
            {
                var hc = ObjectClass.GetSingletone().GetHashCode();
                Console.WriteLine(hc);
            }));
        }
    }

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    public class ObjectClass
    {
        private static ObjectClass singleton=new ObjectClass();
        private ObjectClass()
        {
        }

        public static  ObjectClass GetSingletone()
        {
            return singleton;
        }
    }

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    public class ObjectClass
    {
        private static ObjectClass singleton = new ObjectClass();
        private static object lockObj = new object();
        private ObjectClass()
        {
        }

        public static ObjectClass GetSingletone()
        {
            lock (lockObj)
            {
                if (singleton == null)
                {
                    singleton = new ObjectClass();
                }
            }
            return singleton;
        }
    }

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     public static ObjectClass GetSingletone()
        {
            if (singleton == null)
            {
                lock (lockObj)
                {
                    if (singleton == null)
                    {
                        singleton = new ObjectClass();
                    }
                } 
            }
            return singleton;
        }

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