Logger.cs

    class Logger
    {
        private static volatile Logger instance;
        private EventLog _evLog;
        private static object lockObject = new object();

        public Logger(string logApp, string source)
        {
            if (!EventLog.SourceExists(source))
                EventLog.CreateEventSource(source, logApp);

            _evLog = new EventLog(logApp)
            {
                Source = source
            };
        }
        public void Info(string format, params object[] args)
            => Write(EventLogEntryType.Information, format, args);
        public void Warning(string format, params object[] args)
            => Write(EventLogEntryType.Warning, format, args);
        public void Error(string format, params object[] args)
            => Write(EventLogEntryType.Error, format, args);
        private void Write(EventLogEntryType t, string format, params object[] args)
            => _evLog.WriteEntry(String.Format(format, args), t);

        public void Dispose() => _evLog.Dispose();
    }