Function Factorial Learn programming C#

using System;
public class Exercise114
{
    public static int Factorial(int num)
    {
        if (num == 0)
            return 1;
        else
            return num * Factorial(num - 1);
    }

    public static void Main()
    {
        Console.WriteLine("Enter a number:");
        int number = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(Factorial(number));

        Console.WriteLine(Factorial(6));
    }
}