记录日志

     protected void WriteLog(string msg)
        {
            using (FileStream fs = new FileStream(@"C:\Log\Log.txt", FileMode.OpenOrCreate, FileAccess.Write,FileShare.Write,20480,true))
            {
                StreamWriter writer = new StreamWriter(fs);
                fs.Seek(0, SeekOrigin.End);
                writer.WriteLine(DateTime.Now.ToString() + "---" + msg);
                writer.Flush();
                writer.Close();
            }
        }