Random slot algorithm

Question

I have two dimensional array. I want to pick a slot at random, and continue to do so never picking the same slot twice until I have finally picked all slots (so nothing ran

Answer 1

I did this for numbers

list PastList=new PastList();
private void Choоse()
{
   int i = Recurs();
   PastList.Add(i);
}

private int Recurs()
{
   int i;

   i = rnd.Next(0, 99);
   if (PastList.Contains(i))
   {
       i = Recurs();
   }

   return i;
}