Here’s a simple trick to easily identify the extension methods in the Visual Studio Intellisense .
The extension methods are marked with the down arrow when the methods are shown in the Visual Studio Intellisense .
![How to Identify Extension Methods in Visual Studio Intellisense ? How to Identify Extension Methods in Visual Studio Intellisense ?](http://www.developerpublish.com/wp-content/uploads/2013/12/122513_1708_HowtoIdenti1.jpg)
In the above screenshot , the methods Aggregate , All , Any etc are all extension methods.