Euler Project 1 in C#

Program.cs

class Program
{
  static void Main(string[] args)
  {
    int totalSum = CalculateSumOfMultiples(3, 1000) + CalculateSumOfMultiples(5, 1000) - CalculateSumOfMultiples(15, 1000);
    Console.WriteLine("The sum of all multiples of 3 and 5 below 1000 is: " + totalSum);
    Console.ReadLine();
  }

  private static int CalculateSumOfMultiples(int divisor, int max)
  {
    int sum = 0;

    for(int i = 0; i * divisor < max; ++i)
    {
      sum += i * divisor;
    }

    return sum;
  }
}