Using ADO.NET Data Services

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 Microsoft.SharePoint;
using Microsoft.SharePoint.Linq;
using System.Net;

namespace ProjectManagers
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        MyDataService.MeetingMangementDataContext ctx = new MyDataService.MeetingMangementDataContext(new Uri("http://crm-server:6861/_vti_bin/ListData.svc"));

        private void Form1_Load(object sender, EventArgs e)
        {
            ctx.Credentials = CredentialCache.DefaultCredentials;
            var q = from a in ctx.Announcements select a;
            this.announcementsItemBindingSource.DataSource = q;
        }

        private void announcementsItemBindingNavigatorSaveItem_Click(object sender, EventArgs e)
        {
            ctx.SaveChanges();
        }

        private void announcementsItemBindingSource_CurrentChanged(object sender, EventArgs e)
        {
            ctx.UpdateObject(this.announcementsItemBindingSource.Current);
        }

    }
}