c# 简单日志记录

FileStream fs = new FileStream(System.AppDomain.CurrentDomain.BaseDirectory + "log.txt",FileMode.Append);
                byte[] data1 = System.Text.Encoding.Default.GetBytes(eeee.Message);
                byte[] data2 = System.Text.Encoding.Default.GetBytes(eeee.StackTrace);
                fs.Write(data1,,data1.Length);
                fs.Write(data2, , data2.Length);
                fs.Flush();
                fs.Close();