Factorial in c#

using System;

class Factorial
{
    static void Main()
    {
        Console.Write("Enter a int value: ");

        int num = Convert.ToInt32(Console.ReadLine());
        int factorial = 1;
        for (int i = num; i > 0; i--) {
            factorial *= i;
        }

        Console.WriteLine("The factorial of {0} is: {1}", num, factorial);
    }
}