Fibonacci counter - C# Code Bank

                //Be aware it could overflow for large iterations.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FibonnacciCounter
{
    class Program
    {
        static void Main(string[] args)
        {
            //Variable initialisation
            string userInt;
            int maxNumber = 0;
            bool correctValue = false;

            //so that only numbers get through
            do
            {
                //User input
                Console.Write(\"what number do you want to count up to >\");
                userInt = Console.ReadLine();

                try
                {
                    maxNumber = int.Parse(userInt);
                    correctValue = true;
                }

                catch
                {
                    Console.WriteLine(\"Not a valid number\");
                }
            } while (correctValue == false);

            //More variable initialisation
            int firstNumber = 0;
            int secondNumber = 1;
            int total = 0;

            //Main iteration loop
            for (int i = 0; i <= maxNumber; i++)
            {
                int temp = firstNumber;
                firstNumber = secondNumber;
                secondNumber = temp + secondNumber;
                Console.WriteLine(\"{0} iteration is - {1}\", i, secondNumber);

                //Checking if deviding by two leaves a remainder, if so its not part of the sequence
                if (secondNumber % 2 == 0)
                {
                    total += secondNumber;
                }
            }
            Console.ReadLine();
        }
    }
}