public static void Shuffle<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;    } }