How to work with extension methods in C#

Extension methods can be used to inject new functionality to a type without needing to modify, derive, or recompile the original type

The meaning of this on extension methods - Follow the white rabbit Follow the white rabbit

Implementing a Static Builder using Extension Methods in C#

C#: [Obsolete] on an extension method? Also remove 'this' – paint.net blog

You can use extension methods to add functionality specific to a particular enum type. In our example we use an enum to define neighbors on a square tiled board. And we add

C# Extension Methods

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Extension Method in C#. Everything You Need To Learn