How do I loop a switch function in C#

I've written a code so you can roll a dice but I want the dice to flash different sides of it before ending on its final side. When using a switch in a for loop, the switch doesn't seem to work. This is what I have so far.

        Random r = new Random();

        for (int i = 0; i < 10; i++) 
        {
            Thread.Sleep(1000);

            foreach (Control x in this.Controls)
            {
                if (x is PictureBox && x.Tag.ToString() == "Dice")
                { x.Visible = false; }
            }

            int rInt = r.Next(1, 7);

            switch (rInt)
            {
                case 1: Dice1.Visible = true; break;
                case 2: Dice2.Visible = true; break;
                case 3: Dice3.Visible = true; break;
                case 4: Dice4.Visible = true; break;
                case 5: Dice5.Visible = true; break;
                case 6: Dice6.Visible = true; break;
            }

            Console.WriteLine(rInt);
        }

The output in the console shows that it does take 10 random numbers yet switch doesn't seem to execute except for the last one.

Does anybody know if I'm doing something wrong?