C# - Null-coalescing Operator

The "??" operator is called the null-coalescing operator and is used to define a default value for a nullable value types as well as reference types. It returns the left-hand operand if it is not null; otherwise it returns the right operand.


Example:

int? a = 123;
int? b = 5;
int? x = a ?? b;

/*Output:x = 123*/



int? a = null;
int? b = 5;
int? x = a ?? b;

/*Output:x = 5*/