//Main
using static Logger.Logging;
Log();
Info("Application started.", "NetworkPing");
Warning("Application about to exit!", "MyApp");
Error(ex, "MyApp");

//Logger.cs
using System;
using System.Diagnostics;
using System.IO;

class Logging
{
    static readonly string LogDirectory = Path.GetTempPath() + "\\" + AppDomain.CurrentDomain.FriendlyName;
    internal static string LogFile = LogDirectory + @"\Application.log";
    static readonly string LogBak = LogDirectory + @"\Application.log.bak";

    public static void Log()
    {
        if (!Directory.Exists(LogDirectory))
        {
            Directory.CreateDirectory(LogDirectory);
        }
        if (File.Exists(LogBak))
        {
            File.Delete(LogBak);
        }
        if (File.Exists(LogFile))
        {
            File.Copy(LogFile, LogBak);
            File.Delete(LogFile);
        }
        Trace.Listeners.Clear();
        TextWriterTraceListener twtl = null;
        try
        {
            twtl = new TextWriterTraceListener(LogFile);
            ConsoleTraceListener ctl = null;
            try
            {
                ctl = new ConsoleTraceListener(false);
                Trace.Listeners.Add(twtl);
                Trace.Listeners.Add(ctl);
                Trace.AutoFlush = true;
            }
            finally
            {
                if (ctl != null)
                {
                    ctl.Dispose();
                }
            }
        }
        finally
        {
            if (twtl != null)
            {
                twtl.Dispose();
            }
        }
    }

    public static void Error(string message, string module)
    {
        WriteEntry(message, "error", module);
    }

    public static void Error(Exception ex, string module)
    {
        WriteEntry(ex.Message, "error", module);
    }

    public static void Warning(string message, string module)
    {
        WriteEntry(message, "warning", module);
    }

    public static void Info(string message, string module)
    {
        WriteEntry(message, "info", module);
    }

    private static void WriteEntry(string message, string type, string module)
    {
        Trace.WriteLine(
                string.Format("{0}     ( {1} - {2} )     |     {3}",
                              DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),
                              type,
                              module,
                              message));
    }
}