Let's say you have a List<T> and want to order that list by random.  Quite easy with the following extension method:

    static class ShuffleListExtension
    {
        private static Random rng = new Random();

        public static void Shuffle<T>(this IList<T> list)
        {
            int n = list.Count;
            while (n > 1)
            {
                n--;
                int k = rng.Next(n + 1);
                T value = list[k];
                list[k] = list[n];
                list[n] = value;
            }
        }
    }

Everytime you call .Shuffle() the list will be again randomly reordered.

   result = DbEntity.Where(...).ToList().Shuffle();
   result = result.Shuffle();   // re-order the list a 2nd time