i am not getting the desired output while running this code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using VDS.RDF;
using VDS.RDF.Writing;


namespace dotnetrdf2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        
        private void Form1_Load(object sender, EventArgs e)
        {
            Graph g = new Graph();

            IUriNode dotNetRDF = g.CreateUriNode(UriFactory.Create("http://www.dotnetrdf.org"));
            IUriNode says = g.CreateUriNode(UriFactory.Create("http://example.org/says"));
            ILiteralNode helloWorld = g.CreateLiteralNode("Hello World");
            ILiteralNode bonjourMonde = g.CreateLiteralNode("Bonjour tout le Monde", "fr");

            g.Assert(new Triple(dotNetRDF, says, helloWorld));
            g.Assert(new Triple(dotNetRDF, says, bonjourMonde));

            foreach (Triple t in g.Triples)
            {
                Console.WriteLine(t.ToString());
            }

            NTriplesWriter ntwriter = new NTriplesWriter();
            ntwriter.Save(g, "HelloWorld.nt");

            RdfXmlWriter rdfxmlwriter = new RdfXmlWriter();
            rdfxmlwriter.Save(g, "HelloWorld.rdf");

            Console.ReadLine();
        }
    }
}