factorial of number ?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace factorial

{

    class Program

    {

       static void Main(string[] args)

       {

           int num,i,fact=1;

           Console.WriteLine("enter the number ");

           num = Int32.Parse(Console.ReadLine());

           for (i = 1; i <=num; i++)

           {

               fact = fact * i;

           }

           Console.WriteLine("factorial of number are " + fact);

           Console.WriteLine();

       }

    }

}