The null interface operator provides a shortcut to indicate null when processing null and reference types. This operator is placed between two operands. The first operation must be of a null or reference type, and the second operation must be of the same type as the first operation, alternatively, it can be implicitly converted to the type of the first operand. The null operation operator is calculated as follows: if the first operand is not null, the entire expression is equal to the value of the first operand. However, if the first operand is null, the entire expression is equal to the value of the second operand. Int ? A = Null ;
Int B;
B = A ?? 10 ;
Console. writeline (B. tostring ());
A = 100 ;
B = A ?? 10 ;
Console. writeline (B. tostring ());
Console. Read ();
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