<?xml version="1.0" encoding="utf-8" ?>

<log4net>

    <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">

        <filter type="log4net.Filter.LevelMatchFilter">

            <levelToMatch value="ERROR" />

        </filter>

        <filter type="log4net.Filter.DenyAllFilter" />

        <File value="Logs\err.log" />

        <appendToFile value="true" />

        <rollingStyle value="Date" />

        <datePattern value="yyyyMMdd" />

        <layout type="log4net.Layout.PatternLayout">

            <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />

        </layout>

    </appender>

    <appender name="infoAppender" type="log4net.Appender.RollingFileAppender">

        <filter type="log4net.Filter.LevelMatchFilter">

            <levelToMatch value="INFO" />

        </filter>

        <filter type="log4net.Filter.DenyAllFilter" />

        <File value="Logs\info.log" />

        <appendToFile value="true" />

        <rollingStyle value="Date" />

        <datePattern value="yyyyMMdd" />

        <layout type="log4net.Layout.PatternLayout">

            <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />

        </layout>

    </appender>

    <appender name="debugAppender" type="log4net.Appender.RollingFileAppender">

        <filter type="log4net.Filter.LevelMatchFilter">

            <levelToMatch value="DEBUG" />

        </filter>

        <filter type="log4net.Filter.DenyAllFilter" />

        <File value="Logs\debug.log" />

        <appendToFile value="true" />

        <rollingStyle value="Date" />

        <datePattern value="yyyyMMdd" />

        <layout type="log4net.Layout.PatternLayout">

            <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />

        </layout>

    </appender>

    <root>

        <level value="ALL" />

        <appender-ref ref="errorAppender" />

        <appender-ref ref="infoAppender" />

        <appender-ref ref="debugAppender" />

    </root>

</log4net>

 log4net.Config.XmlConfigurator.Configure(new FileInfo(AppDomain.CurrentDomain.BaseDirectory+@"configs\log4net.config"));

public static ILog Logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

Logger.Info(Exception ex);

Logger.Error();