Randomly shuffles items in a list

ListShuffle.cs

public static class ListShuffle
{
    public static void Shuffle<T>(this IList<T> list)
    {
        Random rng = new Random();
        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;
        }
    }

    public static void ShuffleHard<T>(this IList<T> list)
    {
        RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider();
        int n = list.Count;
        while (n > 1)
        {
            byte[] box = new byte[1];
            do provider.GetBytes(box);
            while (!(box[0] < n * (Byte.MaxValue / n)));
            int k = (box[0] % n);
            n--;
            T value = list[k];
            list[k] = list[n];
            list[n] = value;
        }
    }
}