string message = "Hello World";
string result = message ?? "null";
// result = "Hello World";
string message = null;
string result = message ?? "It's null";
// result = "It's null"
string message = "Hello World";
string result = message ?? "null";
// result = "Hello World";
string message = null;
string result = message ?? "It's null";
// result = "It's null"