IOrderedEnumerable<TElement>
using System.Collections;
using System.Collections.Generic;
namespace System.Linq
{
public interface IOrderedEnumerable<TElement> : IEnumerable<TElement>, IEnumerable
{
IOrderedEnumerable<TElement> CreateOrderedEnumerable<TKey>(Func<TElement, TKey> keySelector, IComparer<TKey> comparer, bool descending);
}
}