log4net oracle doesn't work - log4net

Question

I made a log4net project with WinForm about keeping logs in the database. I contacted SQL Server and wrote logs here. But when I try to contact to Oracle and save log in Oracle database, it didn't work. Why? I am sure the connection string is correct, but it does not work. Is there something wrong with the connection string or is there something else I need to implement for Oracle?
Here is my Log4net.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigrationSectionHandler,log4net"/>
</configSections>
<log4net>
<root>
<level value="All"></level>
<appender-ref ref="AdoNetAppender_Oracle"></appender-ref>
</root>
<appender name="AdoNetAppender_Oracle" type="log4net.Appender.AdoNetAppender">
<connectionType value="Oracle.DataAccess.Client.OracleConnection, Oracle.DataAccess,Version=2.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
<connectionString value="Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=MYHOST)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=MYDBNAME)));User Id=MYUSERID;Password=MYPASSWORD;" />
<commandText value="INSERT INTO Log (Datetime,Thread,Log_Level,Logger,Message) VALUES (:log_date, :thread, :log_level, :logger, :message)" />
<bufferSize value="1" />
<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>
</appender>
</log4net>
</configuration>