[CSharp] binary operator used to judge whether the expression is null

First, let's take a look at the traditional method. We need to determine whether the expression is null and assign values to conditions:

1 // Trielement operator to determine whether the expression is null and assign a conditional value
2 exp2 = (exp1! = Null )? Exp1: "not null value ";

Do you think it is a bit tedious to write? Now let's look at the binary operator "double question mark" provided in the c #2.0 era:

1 // The new syntax provided by C #2.0 has the same implementation function as the previous example.
2 exp2 = exp1 ?? "Not null value ";

Is it easy to write?