Log4Net不写入数据库，但工作

我看了很多关于这个的线程，我似乎看不出为什么我的代码不工作。我正在登录控制台和文件appender，但数据库日志从未工作。

我的app.config设置是:

  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" requirePermission="false"/>
  </configSections>
  <!-- Log4net Logging Setup -->
  <log4net>
    <appender name="Console" type="log4net.Appender.ConsoleAppender">
      <threshold value="Debug" />
      <layout type="log4net.Layout.PatternLayout">
        <!-- Pattern to output the caller's file name and line number -->
        <conversionPattern value="%5level [%thread] (%file:%line) - %message%newline" />
      </layout>
    </appender>
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <threshold value="Info" />
      <file value="C:''Sample.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="250KB" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
    <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
      <threshold value="Error" />
      <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
      <connectionString value="Connection_String"/>
      <commandText value="MyStoredProc" />
      <commandType value="StoredProcedure" />
      <parameter name="AgentId">
        <parameterName value="@AgentId"/>
        <dbType value="String"/>
        <size value="6"/>
        <layout type="log4net.Layout.PatternLayout" value="%property{AgentId}" />
      </parameter>
      <parameter name="customerId">
        <parameterName value="@customerId"/>
        <dbType value="String"/>
        <size value="15"/>
        <layout type="log4net.Layout.PatternLayout" value="%property{customerId}" />
      </parameter>
      <parameter>
        <parameterName value="@log"/>
        <dbType value="String"/>
        <size value="4000"/>
        <layout type="log4net.Layout.PatternLayout" value="%message"/>
      </parameter>
      <parameter>
        <parameterName value="@ErrorDate"/>
        <dbType value="DateTime"/>
        <layout type="log4net.Layout.PatternLayout" value="%date{yyyy'-'MM'-'dd HH':'mm':'ss'.'fff}"/>
      </parameter>
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="Console" />
      <appender-ref ref="RollingFileAppender" />
      <appender-ref ref="AdoNetAppender" />
    </root>
  </log4net>

c#代码是:

log4net.Config.BasicConfigurator.Configure();
log4net.ILog Log = log4net.LogManager.GetLogger(typeof(T));
log4net.LogicalThreadContext.Properties["AgentId"] = agentId;
log4net.LogicalThreadContext.Properties["customerId"] = custId;
Log.Error(String.Format("Non fatal error: {0} ({1})", ex.Message, ex.InnerException), ex);