Shuffle

public T[] Shuffle<T>(T[] array)
{
  Random rnd = new Random();
  for (int i = 0; i < array.Length; ++i)
  {
    int idx = rnd.Next(array.Length);
    T tmp = array[i];
    array[i] = array[idx];
    array[idx] = tmp;
    }
    return array;
}