factorial number program in c#

frequently asking logical program in interviews for dotnet fresher using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication87
{
    class Program
    {
        static void Main(string[] args)
        {
            int i, number, fact;
            Console.WriteLine("Enter the Number:");
            number = int.Parse(Console.ReadLine());
            fact = number;
            for (i = number - 1; i >= 1; i--)
            {
                fact = fact * i;
            }
            Console.WriteLine("\nFactorial of Given Number is: " + fact);
            Console.ReadLine();

        }
    }
}

output screen: