Algorithm for combination generator

Hi

I'm wondering if you could give me a hand with an algorithm.

I need to write a algorithm for generating combinations from n number of sets (of integers).

I can write code that will take my fixed number of sets and produce the combinations but Im lost on how I would be able to do this for n number of sets.

I've attached code for generating combinations from a fixed number of sets.

Will appreciate anyones help or guidance.

Thanks

int[] firstSet = new int[] { 1, 2, 3, 4, 5 };
        int[] secondSet = new int[] { 6, 7, 8, 9, 10, 11 };
        int[] thirdSet = new int[] { 12, 13, 14 };
        int[] fourthSet = new int[] { 15, 16, 17, 18 };
        int counter = 0;
 
        foreach (int firstSetVariable in firstSet)
        {
            foreach (int secondSetVariable in secondSet)
            {
                foreach (int thirdSetVariable in thirdSet)
                {
                    foreach (int fourthSetVariable in fourthSet)
                    {
                        Response.Write(counter + ": " + firstSetVariable + "," + secondSetVariable + "," + thirdSetVariable + "," + fourthSetVariable + "<br />");
                        counter += 1;
                    }
                }
            }
        }

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