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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Using Hashtable is better.
@Pankwood, I think you should not need to use orderBy as it will take you O(nlogn) time so it is not better. Correct me if I am wrong.
I am not sure 100% about GroupBy's bigo but I think it will take you O(n) for group therefore in general it will take you O(n). I have similiar implementation by using hashtable, but IMHO it is the best answer ans he understands very well about Linq and utilize it very well. I really like it.