LogManager.Configuration = new XmlLoggingConfiguration("assets/packages/nlog/nlog.config");

private static readonly ILogger Logger = LogManager.GetCurrentClassLogger();

public MyClass()
{
    Console.Write("lol");
    Logger.Debug("Debug test...");
    Logger.Error("Debug test...");
    Logger.Fatal("Debug test...");
    Logger.Info("Debug test...");
    Logger.Trace("Debug test...");
    Logger.Warn("Debug test...");
}

class MyLoggerClass
{
    public static Logger Logger = LogManager.GetCurrentClassLogger();
}

class MyClass
{
    static void Main(string[] args)
    {

        Console.Write("lol");
        MyLoggerClass.Logger.Debug("Debug test...");
        MyLoggerClass.Logger.Error("Debug test...");
        MyLoggerClass.Logger.Fatal("Debug test...");
        MyLoggerClass.Logger.Info("Debug test...");
        MyLoggerClass.Logger.Trace("Debug test...");
        MyLoggerClass.Logger.Warn("Debug test...");
    }
}

class MyClass
{
    private static Logger Logger = LogManager.GetCurrentClassLogger();
    static void Main(string[] args)
    {
        Console.Write("lol");
        Logger.Debug("Debug test...");
        Logger.Error("Debug test...");
        Logger.Fatal("Debug test...");
        Logger.Info("Debug test...");
        Logger.Trace("Debug test...");
        Logger.Warn("Debug test...");
    }
}

2017-02-26 16:13:44.8388|ERROR|NLogTest.Program|Debug test...
2017-02-26 16:13:44.8856|FATAL|NLogTest.Program|Debug test...
2017-02-26 16:13:44.8856|INFO|NLogTest.Program|Debug test...
2017-02-26 16:13:44.8971|WARN|NLogTest.Program|Debug test...