Asking about log4net just write to appender when i stopped site - log4net

Question

Currently, I already config my project, but I got the issue
I can't query any message when the site is running.
When I stop the site, I can query it on database again and I see them.
Why do I just see message when I stop the site?
This is my code.
<log4net>
<root>
<level value="ALL" />
<appender-ref ref="asyncForwarder" />
</root>
<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
<bufferSize value="4096" />
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<connectionString value="data source=***;initial catalog=***;integrated security=false;persist security info=True;User ID=***;Password=***" />
<commandText value="INSERT INTO LogAPI ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (#log_date, #thread, #log_level, #logger, #message, #exception)" />
<parameter>
<parameterName value="#log_date" />
<dbType value="DateTime" />
<layout type="log4net.Layout.RawTimeStampLayout" />
</parameter>
<parameter>
<parameterName value="#thread" />
<dbType value="String" />
<size value="255" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%thread" />
</layout>
</parameter>
<parameter>
<parameterName value="#log_level" />
<dbType value="String" />
<size value="50" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%level" />
</layout>
</parameter>
<parameter>
<parameterName value="#logger" />
<dbType value="String" />
<size value="255" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%logger" />
</layout>
</parameter>
<parameter>
<parameterName value="#message" />
<dbType value="String" />
<size value="4000" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%message" />
</layout>
</parameter>
<parameter>
<parameterName value="#exception" />
<dbType value="String" />
<size value="2000" />
<layout type="log4net.Layout.ExceptionLayout" />
</parameter>
</appender>
<appender name="asyncForwarder" type="Log4Net.Async.ParallelForwardingAppender,Log4Net.Async">
<appender-ref ref="AdoNetAppender" />
<bufferSize value="4096" />
</appender>
</log4net>
I dont know what is correct concept on the log4net.