Логирование с использованием NLog + Sentinel 
Nlog (Nuget) - 
PM> Install-Package NLog

Pasted from <http://www.nuget.org/packages/nlog> 


Sentinel - (http://sentinel.codeplex.com/downloads/get/clickOnce/Sentinel.application)



//1) Класс логгера
using NLog;
using NLog.Config;
using NLog.Targets;

//USAGE SAMPLE:
//private void button1_Click(object sender, EventArgs e)
//{
            
//    try
//    {
//        Log.Instance.Debug("We're going to throw an exception now.");
//        Log.Instance.Warn("It's gonna happen!!");
//        throw new ApplicationException();
//    }
//    catch (ApplicationException ae)
//    {
//        Log.Instance.ErrorException("Error doing something...", ae);
//    }
            
//}

internal static class Log
{
    public static Logger Instance { get; private set; }

    static Log()
    {
#if DEBUG
        // Setup the logging view for Sentinel - http://sentinel.codeplex.com
        var sentinalTarget = new NLogViewerTarget()
                             {
                                 Name = "sentinal",
                                 Address = "udp://127.0.0.1:9999",
                                 IncludeNLogData = false
                             };
        var sentinalRule = new LoggingRule("*", LogLevel.Trace, sentinalTarget);
        LogManager.Configuration.AddTarget("sentinal", sentinalTarget);
        LogManager.Configuration.LoggingRules.Add(sentinalRule);

        // Setup the logging view for Harvester - http://harvester.codeplex.com
        var harvesterTarget = new OutputDebugStringTarget()
                              {
                                  Name = "harvester",
                                  Layout = "${log4jxmlevent:includeNLogData=false}"
                              };
        var harvesterRule = new LoggingRule("*", LogLevel.Trace, harvesterTarget);
        LogManager.Configuration.AddTarget("harvester", harvesterTarget);
        LogManager.Configuration.LoggingRules.Add(harvesterRule);
#endif

        LogManager.ReconfigExistingLoggers();

        Instance = LogManager.GetCurrentClassLogger();
    }
}

//2) Файл NLog.config (В свойствах установить Copy To Output Directory => Copy Always)
<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      throwExceptions="false">

  <variable name="appName" value="YourAppName" />

  <targets async="true">
    <target xsi:type="File"
            name="default"
            layout="${longdate} - ${level:uppercase=true}: ${message}${onexception:${newline}EXCEPTION\: ${exception:format=ToString}}"
            fileName="${specialfolder:ApplicationData}\${appName}\Debug.log"
            keepFileOpen="false"
            archiveFileName="${specialfolder:ApplicationData}\${appName}\Debug_${shortdate}.{##}.log"
            archiveNumbering="Sequence"
            archiveEvery="Day"
            maxArchiveFiles="30"
    />

    <target xsi:type="EventLog"
            name="eventlog"
            source="${appName}"
            layout="${message}${newline}${exception:format=ToString}"/>
  </targets>
  <rules>
    <logger name="*" writeTo="default" minlevel="Info" />
    <logger name="*" writeTo="eventlog" minlevel="Error" />
  </rules>
</nlog>