C logging method

        public void WriteLogFile(string input)
        {
            string logPath = Directory.GetCurrentDirectory() + "\\LogFile";

            // Judge whether the folder under this path exists , Create a new folder if it does not exist 
            if (!Directory.Exists(logPath))
            {
                Directory.CreateDirectory(logPath);
            }
            // Specifies the directory for the log files 
            string fname = logPath + "\\LogFile.txt";

            // Define file information objects 
            FileInfo finfo = new FileInfo(fname);

            if (!finfo.Exists)
            {
                FileStream fs;
                fs = File.Create(fname);
                fs.Close();
                finfo = new FileInfo(fname);
            }

            // Determine whether the file exists and whether it is greater than 2K
            if (finfo.Length > 1024 * 1024 * 10)
            {
                // The document exceeds 10MB Rename 
                File.Move(Directory.GetCurrentDirectory() + "\\LogFile.txt", Directory.GetCurrentDirectory() + DateTime.Now.TimeOfDay + "\\LogFile.txt");
            }
            // Create a write only file stream 
            using (FileStream fs = finfo.OpenWrite())
            {
                // Create a write data stream based on the file stream created above 
                StreamWriter w = new StreamWriter(fs);

                // Set the start position of the write data stream to the end of the file stream 
                w.BaseStream.Seek(0, SeekOrigin.End);

                // write in “Log Entry : ”
                w.Write("\n\rLog Entry : ");

                // Write the current system time and wrap 
                w.Write("{0} {1} \n\r", DateTime.Now.ToLongTimeString(),
                    DateTime.Now.ToLongDateString());

                // Write log contents and wrap 
                w.Write(input + "\n\r");

                // write in ------------------------------------“ And line breaks 
                w.Write("------------------------------------\n\r");

                // Empty buffer contents , And write the contents of the buffer to the underlying stream 
                w.Flush();

                // Close the write data stream 
                w.Close();
            }
        }