[Solved] Product method in c#

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Assuming you mean itertools.product (it looks like it from the example given):

public static List< Tuple<T, T> > Product<T>(List<T> a, List<T> b)
    where T : struct
{
    List<Tuple<T, T>> result = new List<Tuple<T, T>>();

    foreach(T t1 in a)
    {
        foreach(T t2 in b)
            result.Add(Tuple.Create<T, T>(t1, t2));
    }

    return result;
}

n.b. struct here means that T must be a value type or a structure. Change it to class if you need to throw in objects such as Lists, but be aware of potential referencing issues.

Then as a driver:

List<int> listA = new List<int>() { 1, 2, 3 };
List<int> listB = new List<int>() { 7, 8, 9 };

List<Tuple<int, int>> product = Product<int>(listA, listB);
foreach (Tuple<int, int> tuple in product)
    Console.WriteLine(tuple.Item1 + ", " + tuple.Item2);

Output:

1, 7
1, 8
1, 9
2, 7
2, 8
2, 9
3, 7
3, 8
3, 9

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solved Product method in c#