Add element to HashSet in CSharp

using System;//  ww w  .ja va 2  s.co m
using System.Collections.Generic;

public class MainClass
{
    public static void Main(String[] argv)
    {
        HashSet<int> evenNumbers = new HashSet<int>();
        for (int i = 0; i < 5; i++)
        {
            evenNumbers.Add(i * 2);
        }
        
        foreach(int i in evenNumbers){
           Console.WriteLine(i);
        }
    }
}