In this video we’ll talk about extension methods which are simply methods — usually helper methods that can be bolted on to the side of existing types / classes … even if that type is sealed, meaning that it cannot be inherited from. Extension Methods also help promote a more fluent style of programming (which we’ll demonstrate and explain in the video.)

In the past you may have had some helper methods that are intended for operation on certain types … like a formatting method for example. This is similar in concept, but the implementation is cleaner and more elegant.

The reason why Extension Methods are important is because this is how LINQ’s methods, like Select, Where, Sum, Count, are bolted on to the side of types that implement the IEnumerable interface, as well as others. So, Extension Methods are what makes LINQ’s method syntax work.

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