Question

I thought the point of a singleton was I could only initialize one instance at a time? If this is correct, then I must have a fault in my C# console application code (see below).

Would some one please be kind enough to inform me if my understanding of a singleton is correct or if there is an error in my code.

using System;
using System.Collections.Generic;
using System.Text;

namespace TestSingleton
{
    class Program
    {
        static void Main(string[] args)
        {
            Singleton t = Singleton.Instance;
            t.MyProperty = "Hi";

            Singleton t2 = Singleton.Instance;
            t2.MyProperty = "Hello";

            if (t.MyProperty != "")
                Console.WriteLine("No");

            if (t2.MyProperty != "")
                Console.WriteLine("No 2");

            Console.ReadKey();
        }
    }

    public sealed class Singleton
    {
        private static readonly Singleton instance = new Singleton();

        public string MyProperty { get; set; }

        private Singleton()
        {}

        static Singleton()
        { }

        public static Singleton Instance { get { return instance; } }
    }
}

Answer 1

Infact you have only one instance here. You get 2 pointers

Singleton t = Singleton.Instance; //FIRST POINTER
t.MyProperty = "Hi";

Singleton t2 = Singleton.Instance; //SECOND POINTER
t2.MyProperty = "Hello";

But they both are pointing to the same memory location.