C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.Entity.Infrastructure;

namespace PRODATA
{
    public partial class Gammes : Form
    {
        PRODATAEntities BD;
        public Gammes()
        {
            InitializeComponent();
        }

        private void Gammes_Load(object sender, EventArgs e)
        {
            BD = new PRODATAEntities();
            BD.Configuration.ProxyCreationEnabled = false;
            BD.Configuration.LazyLoadingEnabled = false;

            gammeBindingSource.DataSource = BD.Gammes.ToList();

        }

        private void button1_Click(object sender, EventArgs e)
        {
           
            try
            {
                foreach (DbEntityEntry entry in BD.ChangeTracker.Entries())
                {
                    switch (entry.State)
                    {
                        case EntityState.Added:
                            entry.CurrentValues["Utilisateur"] = ((PRODATAparent)(this.MdiParent)).mUtilisateur;
                            entry.CurrentValues["Dateheure"] = DateTime.Now;
                            break;
                        case EntityState.Modified:
                            entry.CurrentValues["Utilisateur"] = ((PRODATAparent)(this.MdiParent)).mUtilisateur;
                            entry.CurrentValues["Dateheure"] = DateTime.Now;
                            break;
                        case EntityState.Deleted:
                            break;
                    }
                }
                dataGridView1.EndEdit();
                gammeBindingSource.EndEdit();
                BD.SaveChanges();
                MessageBox.Show("Enregistrement effectué...", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
                gammeBindingSource.ResetBindings(false);
            }
        }
    }
}

            try
{
  string context = string.Empty;
  string root = null;

  using (LdapConnection connection = new LdapConnection(root))
  {
    connection.Timeout = new TimeSpan(0, 0, 10);
    connection.Bind();
    var filter = "(&(objectClass=*))";
    var searchRequest = new SearchRequest(null, filter, system.DirectoryServices.Protocols.SearchScope.Base, DEFAULTNAMINGCONTEXT);
    var response = connection.SendRequest(searchRequest) as SearchResponse;
    context = response.Entries[0].Attributes[DEFAULTNAMINGCONTEXT][0].ToString();
  }

  return 1;
}
catch (Exception ex)
{
 //Logger.LogError(string.Format("ADSecGetDefaultNamingContext exception => {0}", ex.Message));
 return -1;
}
finally
{
 //Logger.LogInfo("ADSecGetDefaultNamingContext OUT");
}