Question: what is igrouping in c#?
Answer: Remarks. An IGrouping<TKey,TElement> is an IEnumerable<T> that additionally has a key. The key represents the attribute that is common to each value in the IGrouping<TKey,TElement>. The values of an IGrouping<TKey,TElement> are accessed much as the elements of an IEnumerable<T> are accessed.