For when you just want to OrderBy yourself...

OrderBySelfExtensions.cs

using System.Collections.Generic;
using System.Linq;

namespace Mantle.Extensions
{
    public static class EnumerableExtensions
    {
        public static IOrderedEnumerable<T> Order<T>(this IEnumerable<T> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
        
            return (source.OrderBy(i => i));
        }

        public static IOrderedEnumerable<T> OrderDescending<T>(this IEnumerable<T> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
        
            return (source.OrderByDescending(i => i));
        }
    }
}