public Client idSelect(string hash, string username)
        {

            Client clientObj = new Client();

            //Open connection
            if (this.OpenConnection() == true)
            {
                try
                {

                    //Create Command
                    MySqlCommand cmd = new MySqlCommand(null, connection);

                    //Creation de la requête SQL
                    cmd.CommandText = "SELECT * FROM users " + "WHERE us_name=@parUSR " + "AND us_passwd=@parPWD";

                    //Creation des paramètres SQL
                    MySqlParameter parUSR = new MySqlParameter("@parUSR", MySqlDbType.VarChar, 50);
                    MySqlParameter parPWD = new MySqlParameter("@parPWD", MySqlDbType.VarChar, 256);

                    //Assignation des valeurs
                    cmd.Parameters.AddWithValue("@parUSR", username);
                    cmd.Parameters.AddWithValue("@parPWD", hash);

                    //Préparation et exécution de la requête
                    cmd.Prepare();
                    cmd.ExecuteNonQuery();

                    //Create a data reader and Execute the command
                    MySqlDataReader dataReader = cmd.ExecuteReader();

                    //Read the data and store them in the list
                    while (dataReader.Read())
                    {
                        clientObj.Us_id = (dataReader["us_id"]+ "").ToString();
                        clientObj.Us_name = (dataReader["us_name"] + "").ToString();
                        clientObj.Us_passwd = (dataReader["us_passwd"] + "").ToString();
                    }

                    //close Data Reader
                    dataReader.Close();

                    //close Connection
                    this.CloseConnection();

                }

                catch(Exception e)
                {

                }
            }

            return clientObj;

            }