How to maintain the log file to track application performance using C#?

class MethodLog
    {
        //This method is used for calculating method time in each class.
        public void GetMethodLog(string clsname , string methodname , int lineno , string description , string methodstarttime , string methodendtime)
        {
            // get the base directory
            string baseDir = AppDomain.CurrentDomain.BaseDirectory + AppDomain.CurrentDomain.RelativeSearchPath;

            // search the file below the current directory
            string retFilePath = baseDir + "//" + "LogFile.txt";

            // Create a writer and open the file:
            StreamWriter log;

            if (!File.Exists(retFilePath))
            {
                log = new StreamWriter(retFilePath);
            }
            else
            {
                log = File.AppendText(retFilePath);
            }

            string strclsname = "Class Name  : " + clsname ;
            string strmethodname = "Method Name : " + methodname ;
            string strlineno = "Line Number : " + lineno ;
            string strdescription = "Method Description :" + description ;
            string strmethodstarttime = "Method Start Time  :" + methodstarttime ;
            string strmethodendtime = "Method End Time    :" + methodendtime ;
            string eol = "^^---------------------------------------------------------^^";

            // Write log entries to the file:
            log.WriteLine(strclsname);
            log.WriteLine(strmethodname);
            log.WriteLine(strlineno);
            log.WriteLine(strdescription);
            log.WriteLine(strmethodstarttime);
            log.WriteLine(strmethodendtime);
            log.WriteLine(eol); 
          
            // Close the stream:
            log.Close();          
        }
    
    }