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

You've hit a classic [ThreadStatic] "101" here.

The static initializer will only fire once, even though it is marked as [ThreadStatic], so other threads (apart from the first) will see this uninitialised.