Change value type when doing Sum in CSharp

using System;/*from   w w w  .  j av a  2s  . c  o  m*/
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        Random generator = new Random(0);
        int[] numbers = new int[1000];
        for (int i = 0; i < 1000; i++)
        {
            numbers[i] = generator.Next();
        }
        var queryResults = from n in numbers where n > 100 select n;

        Console.WriteLine("Sum of Numbers > 100");
        Console.WriteLine(queryResults.Sum(n => (long)n));

    }
}