Hi

The MSDN library entry to Enumerable.ElementAt(TSource) Method says

"If the type of source implements IList, that implementation is used to obtain the element at the specified index. Otherwise, this method obtains the specified element."

Let's say we have following example:

        ICollection<int> col = new List<int>() { /* fill with items */ };
        IList<int> list = new List<int>() { /* fill with items */ };

        col.ElementAt(10000000);
        list.ElementAt(10000000);

Is there any difference in execution? or does ElementAt recognize that col also implements IList<> although it's only declared as ICollection<>?

Thanks