<log4net>
<root>
<level value="ALL" />
<appender-ref ref="fileAppender" />
</root>
<appender name="fileAppender" type="log4net.Appender.RollingFileAppender" >
<param name="File" value="Logs/log-file_" />
<param name="DatePattern" value="yyyy.MM.dd'.xml'"/>
<param name="AppendToFile" value="true" />
<rollingStyle value="Date" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="10MB" />
<staticLogFileName value="false" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="BloombergSwapData.AdvancedLayoutXml"/>
<!--<layout type="log4net.Layout.XmlLayout"/>-->
<!--<layout type="log4net.Layout.PatternLayout"-->
<param name="ConversionPattern" value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>-->
</appender>
use this configration... Hope it helps... :)