FileStream fs = new FileStream(@"d:\timetick.txt", FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter m_streamWriter = new StreamWriter(fs);
m_streamWriter.BaseStream.Seek(0, SeekOrigin.End);
m_streamWriter.WriteLine(string.Format("Service Start at {0}",DateTime.Now.ToString()));
m_streamWriter.WriteLine(strTemp);
m_streamWriter.Flush();
m_streamWriter.Close();