C# - Singleton Pattern

Question

As you can see from my nickname I'm newbie actually learning about Singleton pattern, where I got one problem. Before I've learned that static constructors are always executed before the standard constructors, but in this code below, the result is different, first I see the "Insta" string then the "Static", why does it happen ?

sealed class Singleton
{
    private static readonly Singleton instance;

    private Singleton()
    {
        Console.WriteLine("Insta");
    }

    static Singleton()
    {
        instance  = new Singleton();
        Console.WriteLine("Static");
    }

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

class Program
{
    static void Main()
    {
        Singleton s1 = Singleton.Instance;

    }

}

Answer 1

If you will write

static Singleton()
{
    Console.WriteLine("Static"); //THIS COMES FIRST
    instance  = new Singleton();

}

you would see what you expect

static ctor is executed at first, as expected, but you print on console after the instance = new Singleton(); line, but this line execute instance ctor, so "inst".

So execution flow:

• static ctor
  • instance = new Singleton();
    • instance ctor prints "insta"
  • "static"