This article presents nothing new at all, but sometimes it is nice to freshen your memory when it comes to smooth stuff available in the .NET Framework. I will give a couple of examples to select, count and look up elements in a collection of objects, both using regular functions and by using lambda expressions. The methods I will use are available when using .NET Framework 3.5.
The complete documentation is available on MSDN, in System.Collection.Generic Namespace documentation.