How can a readonly static field be null?

Question

So here\'s an excerpt from one of my classes:

    [ThreadStatic]
    readonly static private AccountManager _instance = new AccountManager();

    private Ac         


        

Answer 1

Quoting MSDN ThreadStaticAttribute:

Do not specify initial values for fields marked with ThreadStaticAttribute, because such initialization occurs only once, when the class constructor executes, and therefore affects only one thread. If you do not specify an initial value, you can rely on the field being initialized to its default value if it is a value type, or to a null reference (Nothing in Visual Basic) if it is a reference type.