Add Logfile To NLOG Config

        public static void AddLogFileToParent(string subLogDir)
        {
            var logDir = Path.Combine(subLogDir, "..");
            Trace.WriteLine("Adding logfile.txt to" + logDir);
            var config = LogManager.Configuration;

            var logFile = new FileTarget();
            config.AddTarget("file", logFile);

            logFile.FileName = logDir + "\\logfile.txt";
            logFile.Layout = "${date} | ${message}";

            var rule = new LoggingRule("*", LogLevel.Info, logFile);
            config.LoggingRules.Add(rule);

            LogManager.Configuration = config;
        }