private void Load_Presations_Validees()
        {
            try
            {
                conn = new MySqlConnection(Authentification.MyString);
                conn.Open();
                //Jour_Prestation_ListView.Items.Clear();
                string ra = "SELECT prestation.id_prestation, horaire.jour, horaire.date, prestation.heureD, prestation.heureF, horaire.periode" +
                            " FROM (cours INNER JOIN horaire ON cours.id_cours = horaire.id_cours) INNER JOIN prestation ON horaire.id_horaire = prestation.id_horaire" +
                            " WHERE  cours.id_cours=@id_cours";
                MySqlCommand cmd = new MySqlCommand(ra, conn);
                cmd.Parameters.AddWithValue("@id_cours", id_cours);

                MySqlDataReader dr = cmd.ExecuteReader();
                Jour_Prestation_ListView.RowStyle.HorizontalAlign = HorizontalAlign.Center;
                Jour_Prestation_ListView.DataSource = dr;
                Jour_Prestation_ListView.DataBind();

                dr.Close();

                conn.Close();
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
        }
 protected void Jour_Prestation_ListView_PageIndexChanging(object sender, GridViewPageEventArgs e)
 {
     Jour_Prestation_ListView.PageIndex = e.NewPageIndex;
     Jour_Prestation_ListView.DataBind();
     Load_Presations_Validees();
 }