Friday, August 6, 2010

Using log4net in ASP.NET for capturing exceptions to both email and a log file

Here is how I am using log4net to capture exceptions to both
a log file and an email:

Created the following method:

private void
LogError(Exception ex)


ILog loggerFile = LogManager.GetLogger("File");

ILog loggerEmail = LogManager.GetLogger("EmailLog");

loggerFile.Error("Exception in " +
Request.RawUrl, ex);

loggerEmail.Error("Exception in "
+ Request.RawUrl, ex);

  1. }

    Call this method in the “catch” block
    passing the error object instance:

catch (Exception ex)




Added the following in Global.asax:Application_Start():

void Application_Start(object sender, EventArgs


// Code that runs on application startup



Added the following <section> in web.config:

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,


the following section to web.config:


<appender name="LogFileAppender" type="log4net.Appender.FileAppender">

<!-- Please make
shure the ..\\Logs directory exists!

<param name="File" value="Logs\\MyLog4Net.log"/>

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

<conversionPattern value="%newline%date [%thread] %-5level %logger [%property{NDC}] -



<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">

<to value=""/&gt;

<from value=""/&gt;

<subject value="My Application System Error (Log4Net)"/>

<Authentication value="Basic"></Authentication>

<Username value=""></Username&gt;

<Password value="password"></Password>

<Port value="25"></Port>

<smtpHost value=""/>

<bufferSize value="512"/>

<lossy value="false"/>

<Priority value="High"></Priority>

<evaluator type="log4net.Core.LevelEvaluator">

<threshold value="WARN"/>


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

<conversionPattern value="%property{log4net:HostName} :: %level :: %message
%newlineLogger: %logger%newlineThread: %thread%newlineDate: %date%newlineNDC:



<logger name="File">

<level value="DEBUG"/>

<appender-ref ref="LogFileAppender"/>


<logger name="EmailLog">

<level value="WARN"/>

<appender-ref ref="SmtpAppender"/>




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