логи (надо не забыть скопировать в bin)

WinFormsApp/nlog.config

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xsi:schemaLocation="NLog NLog.xsd"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      autoReload="true"
+      internalLogFile="c:\\logs\\internal.log"
+      internalLogLevel="Info">
+	<targets>
+		<target xsi:type="File" name="logfile" fileName="c:\\logs\\winforms.log"
+				layout="${longdate}|${level}|${logger}|${message}"/>
+	</targets>
+
+	<rules>
+		<logger name="*" minlevel="Info" writeTo="logfile" />
+	</rules>
+</nlog>