Simple config example:

<?xml version="1.0" encoding="utf-8" ?><nlogxmlns="http://www.nlog-project.org/schemas/NLog.xsd"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd">      autoReload="true"      internalLogLevel="Warn"      internalLogFile="${basedir}/nlog-internal.txt">    <variablename="defaultLayout"value="${longdate}|${level}|${message:withException=true}" />    <targets>        <targetname="logfile"xsi:type="File"fileName="file.txt"layout="${defaultLayout}" />        <targetname="console"xsi:type="ColoredConsole"layout="${defaultLayout}" />    </targets>    <rules>        <loggername="*"minlevel="Debug"writeTo="logfile" />        <loggername="*"minlevel="Info"writeTo="console" />    </rules></nlog>

Advanced config example:

<?xml version="1.0" encoding="utf-8" ?><nlogxmlns="http://www.nlog-project.org/schemas/NLog.xsd"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd">      autoReload="true"      internalLogLevel="Warn"      internalLogFile="${basedir}/logs/nlog-internal.txt">  <variablename="gmailUsername"value="${trim-whitespace:${file-contents:${basedir}/gmailusername.txt}}" />  <variablename="gmailPassword"value="${trim-whitespace:${file-contents:${basedir}/gmailpassword.txt}}" />  <extensions><!-- load NLog.Web to enable ASP.NET-specific functionality-->    <addassembly="NLog.Web" />  </extensions><!-- define various log targets-->  <targets><!-- write logs to file-->    <targetxsi:type="File"name="file"fileName="${basedir}/logs/${shortdate}.log"layout="${longdate} ${aspnet-request:servervariable=URL} ${uppercase:${level}} ${message}" /><!-- write log message to database-->    <targetxsi:type="Database"name="db"><!-- SQL command to be executed for each entry-->      <commandText>INSERT INTO [LogEntries](TimeStamp, Message, Level, Logger) VALUES(getutcdate(), @msg, @level, @logger)</commandText><!-- parameters for the command-->      <parametername="@msg"layout="${message}" />      <parametername="@level"layout="${level}" />      <parametername="@logger"layout="${logger}" /><!-- connection string-->      <dbProvider>System.Data.SqlClient</dbProvider>      <connectionString>server=.\SQLEXPRESS;database=MyLogs;integrated security=sspi</connectionString><!-- commands to install database-->      <install-command>        <text>CREATE DATABASE MyLogs</text>        <connectionString>server=.\SQLEXPRESS;database=master;integrated security=sspi</connectionString>        <ignoreFailures>true</ignoreFailures>      </install-command>      <install-command>        <text>          CREATE TABLE LogEntries(          id int primary key not null identity(1,1),          TimeStamp datetime2,          Message nvarchar(max),          level nvarchar(10),          logger nvarchar(128))        </text>      </install-command><!-- commands to uninstall database-->      <uninstall-command>        <text>DROP DATABASE MyLogs</text>        <connectionString>server=.\SQLEXPRESS;database=master;integrated security=sspi</connectionString>        <ignoreFailures>true</ignoreFailures>      </uninstall-command>    </target><!-- log message to event log-->    <targetxsi:type="EventLog"name="eventLog"source="NLog Demo"layout="${message}${newline}Call site: ${callsite:className=true:methodName=true}${newline}Logger: ${logger}">    </target><!-- increase the performance counter-->    <targetxsi:type="PerfCounter"name="pc1"categoryName="My Log"counterName="My Counter">    </target><!-- send mail through GMail server-->    <targetxsi:type="Mail"name="mail"smtpServer="smtp.gmail.com"smtpPort="587"enableSsl="true"smtpAuthentication="Basic"smtpUserName="${gmailUsername}"smtpPassword="${gmailPassword}"from="${gmailUsername}"to="${gmailUsername}"subject="NLogDemo logs"addNewLines="true"            /><!-- send mail asynchronously, so that it does not block the calling thread-->    <wrapper-targetxsi:type="AsyncWrapper"name="asyncMail">      <target-refname="mail"/>    </wrapper-target>    <wrapper-targetxsi:type="AspNetBufferingWrapper"name="allOutputs">      <wrapper-targetxsi:type="PostFilteringWrapper">        <compound-targetxsi:type="SplitGroup">          <target-refname="file" />          <target-refname="db" />          <target-refname="eventLog" />          <target-refname="pc1" />          <target-refname="asyncMail" />        </compound-target><!-- during normal execution only log Info messages-->        <defaultFilter>level >= LogLevel.Info</defaultFilter><!-- if there is at least one error, log everything from trace level-->        <whenexists="level >= LogLevel.Error"filter="level >= LogLevel.Trace" />      </wrapper-target>    </wrapper-target>  </targets>  <rules>    <loggername="*"minlevel="Trace"writeTo="allOutputs" />  </rules></nlog>