Extension methods are great! In the past I would simulate Extension methods by building Bookmark folders in Visual Studios for common string functions, math functions etc. I then migrated to using code snippet tools to save little reusable snippets of code, but always found it difficult for others to know that I had implemented a new code snippet and that they could now use it in their code. But alas, along came Extension methods and all my problems were solved. I now have a great way to organise all my code snippets into a contextual structure and also make it immediately available to the rest of the developers in my team. Below is a simple example of extending the Dictionary class to implement a "SortDictionary" method.