static void Main(string[] args) { Console.WriteLine("Demo Singleton"); Singleton singleton1 = Singleton.GetInstance(); Singleton singleton2 = Singleton.GetInstance(); Console.WriteLine($"info = {singleton1.GetInfo()}"); singleton1.SetInfo(2); Console.WriteLine($"info = {singleton2.GetInfo()}"); singleton2.SetInfo(3); Console.WriteLine($"info = {singleton1.GetInfo()}"); Console.ReadKey(); }