Question

How to Use the Null Coalescing Operator (??) in C# ?

Answer 1

It is a   is a binary operator that simplifies checking for null values. It can be used with both nullable types and reference types. It is represented as x ?? y which means if x is non-null, evaluate to x; otherwise, y. In the syntax x ?? y  x is the first operand which is a variable of a nullable type. y is the second operand which has a non-nullable value of the same type. While executing code, if x evaluates to null, y is returned as the value. Also remember that the null coalescing operator (??) is right-associative which means it is evaluated from right to left. So if you have an expression of the form x ?? y ?? z, this expression is evaluated as x?? (y?? z).