static void Main(string[] args)
{
var instance1 = Singleton_V2.GetInstance();
var instance2 = Singleton_V2.GetInstance();
Console.WriteLine(instance1 == instance2);
Console.ReadKey();
}
static void Main(string[] args)
{
// 6 different implementations of Singleton design pattern
// The best solution is Singleton Version 4
Singleton_V1 singleton_V1 = Singleton_V1.Instance;
Singleton_V2 singleton_V2 = Singleton_V2.Instance;
Singleton_V3 singleton_V3 = Singleton_V3.Instance;
Singleton_V4 singleton_V4 = Singleton_V4.Instance;
Singleton_V5 singleton_V5 = Singleton_V5.Instance;
Singleton_V6 singleton_V6 = Singleton_V6.Instance;
// All examples were taken from book "C# In Depth" Jon Skeet
}