Average an integer array in CSharp

using System;/* www.  j  a va 2  s  .  c o  m*/
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

        double averageNum = numbers.Average();

        Console.WriteLine("The average number is {0}.", averageNum);
    }
}