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===Extension methods and Null coalescing===
{{Unreferenced section|date=June 2023}}
In some [[Microsoft .NET]] languages, [[Extension method]]s can be used to perform what is called 'null coalescing'. This is because extension methods can be called on null values as if it concerns an 'instance method invocation' while in fact extension methods are static. Extension methods can be made to check for null values, thereby freeing code that uses them from ever having to do so. Note that the example below uses the [[C Sharp (programming language)|C#]] [[Null coalescing operator]] to guarantee error free invocation, where it could also have used a more mundane if...then...else. The following example only works when you do not care the existence of null, or you treat null and empty string the same. The assumption may not hold in other applications.
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