public static bool delete(Administrateur admin)
        {
            bool         res = false;
            MySqlCommand cmd = new MySqlCommand();

            cmd.CommandText = "DELETE FROM administration WHERE idA = @idA";
            cmd.Parameters.AddWithValue("@idA", admin.Id);
            cmd.Connection = Connexion.getInstance();

            try
            {
                cmd.ExecuteNonQuery();
                cmd = null;
                res = true;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Erreur de ExecuteNonQuery : " + ex.Message);
            }

            return(res);
        }
        public static void create(Administrateur admin)
        {
            MySqlCommand cmd = new MySqlCommand();

            cmd.CommandText = "INSERT INTO administration(nom, prenom, mail, mdp) " +
                              "VALUES(@nom, @prenom, @mail, @mdp)";
            cmd.Parameters.AddWithValue("@nom", admin.Nom);
            cmd.Parameters.AddWithValue("@prenom", admin.Prenom);
            cmd.Parameters.AddWithValue("@mail", admin.Mail);
            cmd.Parameters.AddWithValue("@mdp", admin.Motdepasse);

            cmd.Connection = Connexion.getInstance();

            try
            {
                cmd.ExecuteNonQuery();
                cmd = null;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Erreur de ExecuteNonQuery : " + ex.Message);
            }
        }