Question

Possible Duplicate:
Hidden Features of C#?

What is it? Is it useful? Where?

??

Answer 1

It work this way;

Object a = otherObject ?? "otherObject is null";

It means otherObject will be assigned to “a” if it is not null. If it is null the object at right will be assigned to “a”.

Its useful for me when I wanna set default values;

public class MyClass
{
    private Object b;
    public MyClass(Object a)
    {
        b = a ?? "Deafult Value";
    }
}

Official documentation can also be found here; MSDN