manojIEnumerable:
OfType<TResult>(IEnumerable) - Filters the elements of an IEnumerable based on a specified type.
Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) - Concatenates two sequences.
GroupBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) - Groups the elements of a sequence according to a specified key selector function.
