static void Main(string[] args) { Singleton _InstanceA = Singleton._GetInstance(); Singleton _InstanceB = Singleton._GetInstance(); if (_InstanceA == _InstanceB) { Console.WriteLine("isEqual : " + _InstanceA + "==" + _InstanceB); } Singleton _InstanceC = Singleton._GetInstance(); if (_InstanceB == _InstanceC) { Console.WriteLine("isEqual : " + _InstanceB + "==" + _InstanceC); } }