public static IOrderedEnumerable <T> AndThen <T, TOrderBy>(this IOrderedEnumerable <T> original,
Func <T, TOrderBy> selector) where TOrderBy : IComparable <TOrderBy>
{
IComparer <T> comparer = new SimpleComparer <T, TOrderBy>(selector);
return(original.CreateSubOrder(comparer));
}
