C#/.NET Little Wonders - The ToLookup() LINQ Extension Method

Once again, in this series of posts I look at the parts of the .NET Framework that may seem trivial, but can really help improve your code by making it easier to write and maintain. LINQ has added so many wonderful extension methods to our .NET toolbox!  In particular, there are a few methods that are useful for creating a collection from an IEnumerable<T>. Included in this set is the ToLookup() method which enables you to create groupings from an enumeration of data.