find the factorial of a number in csharp

main.cs
int num = 5; // the number whose factorial needs to be found
int factorial = 1;

for (int i = 1; i <= num; i++)
{
    factorial *= i;
}

Console.WriteLine("Factorial of " + num + " is " + factorial);
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main.cs
public static int Factorial(int num)
{
    if (num == 0)
    {
        return 1;
    }
    else
    {
        return num * Factorial(num - 1);
    }
}

// calling the method
int num = 5;
int factorial = Factorial(num);

Console.WriteLine("Factorial of " + num + " is " + factorial);
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