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I seem to be having some trouble wrapping my head around the idea of a Generic List of Generic Lists in C#. I think the problem stems form the use of the <T> argument, which I have no prior experience playing with. Could someone provide a short example of declaring a class which is a List, that therein contains another List, but where the type of the object contained therein is not immediately known? I've been reading through the MS documentation on Generics, and I am not immediately sure if I can declare a List<List<T>> , nor how exactly to pass the <T> parameter to the inside list. Edit: Adding information Would declaring a List<List<T>> be considered legal here? In case you are wondering, I am building a class that allows me to use a ulong as the indexer, and (hopefully) steps around the nasty 2GB limit of .Net by maintaining a List of Lists. public class DynamicList64<T> { private List<List<T>> data = new List<List<T>>(); private ulong capacity = 0; private const int maxnumberOfItemsPerList = Int32.MaxValue; public DynamicList64() { data = new List<List<T>>(); }

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