Why can't I initialize my fields in my structs?

Question

I am surprised that I can\'t initialize my fields in structs, why is it like that? Like:

struct MyStruct
{
    private int a = 90;
}

but it

Answer 1

It's for performance. When you new up a struct with the default constructor, all it does is allocate however many bytes on the stack and initialises them to 0.