bool IsPrime(int number)
        {

            if (number == 1) return false;
            if (number == 2) return true;

            for (int i = 2; i <= Math.Ceiling(Math.Sqrt(number)); ++i)
            {
                if (number % i == 0) return false;
            }

            return true;

        }

        int genereteRandomPrime(Random re)
        {
            while (true)
            {
                var sd = re.Next(int.MaxValue);
                if (IsPrime(sd))
                    return sd;
            }
        }

        int genereteRandomPrime(Random re, int max)
        {
            while (true)
            {
                var sd = re.Next(max);
                if (IsPrime(sd))
                    return sd;
            }
        }