Add all the natural numbers below one thousand that are multiples of 3 or 5.

Problem:
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.

My Solution:

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

namespace Euler
{
    class Problem1 : IProblemBase
    {

        //Problem 1
        //If we list all the natural numbers below 10 that are multiples of 3 or 5,
        //we get 3, 5, 6 and 9. The sum of these multiples is 23.

        //Find the sum of all the multiples of 3 or 5 below 1000.

        public Problem1()
        {
        }

        public string GetAnswer()
        {
            int result = 0;
            for(int i=0;i<1000;i++)
            {
                if(i % 3 == 0 || i % 5 == 0)
                {
                    result += i;
                }

            }

            return result.ToString();
        }
    }
}