The Null-Coalescing operator
?? will return the left-hand side when not null. If it is null, it will return the right-hand side.
object foo = null; object bar = new object(); var c = foo ?? bar; //c will be bar since foo was null
?? operator can be chained which allows the removal of
//config will be the first non-null returned. var config = RetrieveConfigOnMachine() ?? RetrieveConfigFromService() ?? new DefaultConfiguration();