试图解决Project Euler＃1的问题

Question

I'm having a problem trying to make a small app to solve Project Euler Problem #1 .

Whenever I attempt to run this, it returns as 0, instead of 233168.

I'm not necessarily looking for an absolute answer, just some hints, I'm trying to learn.

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int x;
            List<int> listOne = new List<int>();
            for (x = 1; x < 1000; ++x)
            {
                if(x%3 == 0 || x%5 == 0)
                {
                    listOne.Add(x);
                }
                Console.WriteLine(listOne.Sum());
                Console.ReadLine();
            }
        }
    }
}

Answer 1

In the interests of helping you learn, I'm not going to provide the exact answer.

Have a look at the scoping of your Console.WriteLine() statement. My guess is that it's not running when you think it should be.