C#

using System;
using System.Linq;
using System.Data.SqlServerCe;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ModeDifféré
{
    public partial class Form6 : Form
    {
        public Form6()
        {
            InitializeComponent();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void Form6_Load(object sender, EventArgs e)
        {

            string sConnection = "Data Source=Bacem-PC;User ID=sa;Password=sa;Initial Catalog=GMAO;Persist Security Info=false;";
            string sSQL = "SELECT Nbt FROM 4BT; ";
            SqlConnection conn = new SqlConnection(sConnection);
            SqlCommand comm = new SqlCommand(sSQL, conn);
            SqlDataReader dr = null;
            try
            {
                
                comm.Connection.Open();
                dr = comm.ExecuteReader();
                while (dr.Read())
                    comboBox1.Items.Add(dr[0]);
            }
            catch (SqlException ex)
            {
                MessageBox.Show("connexion impossible");
                MessageBox.Show(ex.Message);
                return;
            }

            dr.Close();
            comm.Connection.Close();
        }
    }
}