Project Euler Problem1 [C#]

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.

This article will show you how to solve Euler problem number 1 using LINQ in C#.

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

namespace ProjectEuler
{
  class Program
  {
      static void Main(string[] args)
      {
          Console.WriteLine(Problem1());
      }
      /*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 static int Problem1()
      {
          var sum = Enumerable.Range(1, 999)
                  .Where(x => x % 3 == 0 || x % 5 == 0)
                  .Sum();
          return sum;
      }

  }
}