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 Random r = new Random();
 for (int i = 0; i < randomPositions.Length; i++)
            {
                int help = r.Next(0, 5);
                int j = 0;  

                for (j = 0; j < randomPositions.Length; j++)
                {
                    if (help == randomPositions[j])
                    {
                        while (randomPositions[j] == help)
                        {
                            help = r.Next(0, 5);

                        }

                        randomPositions[i] = help;
                    }

                    else
                    {
                        randomPositions[i] = help;
                    }
                }
            }