Implement method like BigInteger Class

using System;
using System.Collections.Generic;


namespace Factorial
{
    class Program
    {
        static void Main()
        {

            List<int> fact = new List<int>();
            fact.Add(1);
            for (int i = 2; i < 100; i++)
            {
                CalcFactorial(fact, i);
                Print(fact);
            }


        }

        private static void Print(List<int> fact)
        {
            for (int i = fact.Count - 1; i >= 0; i--)
            {
                Console.Write(fact[i]);
            }
            Console.WriteLine();
        }

        private static void CalcFactorial(List<int> fact, int n)
        {
            List<int> factCopy = new List<int>();
            for (int i = 0; i < fact.Count; i++)
            {
                factCopy.Add(fact[i]);
            }

            int carryTens;
            int carryHundreds;
            int result;

            for (int i = factCopy.Count - 1; i >= 0; i--)
            {
                result = 0;
                carryTens = 0;
                carryHundreds = 0;
                result = factCopy[i] * n;
                fact[i] = result % 10;


                if (result > 99)
                {
                    carryHundreds = result / 100;
                    carryTens = (result / 10) % 10;
                }
                else if (result > 9)
                {
                    carryTens = result / 10;
                }

                if (carryTens > 0)
                {
                    if (fact.Count < i + 2)
                    {
                        fact.Add(carryTens);
                    }
                    else
                    {
                        fact[i + 1] += carryTens;
                        if (fact[i + 1] > 9)
                        {
                            fact[i + 1] %= 10;
                            carryHundreds++;
                        }

                    }
                }
                if (carryHundreds > 0)
                {
                    if (fact.Count < i + 3)
                    {
                        fact.Add(carryHundreds);
                    }
                    else
                    {
                        fact[i + 2] += carryHundreds;
                    }


                }

            }


        }

    }
}