MySqlConnection =MySqlConnection mới (chuỗi) không hoạt động

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MySqlConnectionStringBuilder connBuilder = new MySqlConnectionStringBuilder();

                    connBuilder.Server = "localhost";
                    connBuilder.UserID = "root";
                    connBuilder.Database = "therapygame";
                    connBuilder.Password = "";
                    connBuilder.OldGuids = true;

                connection = new MySqlConnection(connBuilder.ConnectionString);