LINQ

Extending LINQ with Random Operations
You can create extension methods to extend LINQ. Here's some code I came up with for extending LINQ to return random list items and shuffle lists.
By Jonathan Wood on Saturday, September 22, 2012

Implementing The TakeLast, TakeLastWhile, SkipLast And SkipLastWhile LINQ Operators
Some time ago, I needed to retrieve the last items of a sequence that satisfied some criteria and, looking at the operators available in the Enumerable class, I noticed that there wasn’t such an operator.
By Paulo Morgado on Wednesday, February 09, 2011