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Posted 11 Oct 2006


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Configure Log4Net in ASP.NET 2.0

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11 Oct 2006CPOL
How to configure Log4Net in an ASP.NET 2.0 application.


Log4net is an Open Source utility used for log/report statements to various kinds of output targets (text file, email, database, event viewer etc.): It can be a very handy utility for application instrumentation purposes.

Configuring Log4net

Step 1: Add a reference of Log4net.dll to the project.

Step 2: Add Global.asax to the project, if not already added. In the "Application_Start" event of global.asax, add the following code:


Step 3: In the web.config file, under Configuration->Configsections, add the following section:

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

Step 4: In web.config, add a new section "<log4net>". This section will contain all the settings related to the Log4net configuration.

Step 5: In web.config, under "log4net" section, add the required appenders (output target) configuration sections in the following way:

File appender configuration, used for log statements in a text file
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
  <param name="File" value="Logs\\Log4Net.log"/>
  <layout type="log4net.Layout.PatternLayout">
    <param name="ConversionPattern" value="%d [%t] %-5p %c %m%n"/>
SMTP appender configuration, used for log statements by sending email
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="" />
<from value="" />
<subject value="" />
<smtpHost value="" />
<bufferSize value="512" />
<lossy value="true" />
<evaluator type="log4net.Core.LevelEvaluator">
<threshold value="WARN"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%date [%thread] %-5level 
          %logger [%property] - %message%newline%newline%newline" />

Step 6: In the web.config file, under "log4net" section, for each appender, add loggers in the following way:

<logger name="File">
<level value="All" />
<appender-ref ref="LogFileAppender" />
<logger name="EmailLog">
<level value="All" />
<appender-ref ref="SmtpAppender" />

Step 7: Now, whenever we want to log any information/error/warning, call the appropriate method in the following manner:

//for logging to file
log4net.ILog logger = log4net.LogManager.GetLogger("File");

//for emailing
log4net.ILog logger = log4net.LogManager.GetLogger("EmailLog");

logger.Info("Starting page load");


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Vikramaditya S Shekhawat
Norway Norway
Growing up with the world wide web, witnessing many bubbles and the rise of information technology to becoming an indispensable part of human existence, I was intrigued and astonished by the drastic changes it brought to the way we lived then. I was drawn into this whirlpool of internet and technology as an enthusiast only to come out as a qualified software professional. Worked extensively on technologies, starting with Visual Basic, ASP, Oracle and MS SQL to WCF, .NET Core , Azure service fabric and Kubernetes. Architected applications for on-premises to hybrid clouds to cloud native environments.
Fortunately, I like what I do and work has been fulfilling.
It has been 20+ years of working for various organisations in several roles both technical and managerial but not a
dull day.

Comments and Discussions

GeneralThank You! Pin
Priyanka Kale6-Feb-18 22:30
MemberPriyanka Kale6-Feb-18 22:30 
QuestionNeed some info Pin
Tridip Bhattacharjee18-Oct-14 5:51
professionalTridip Bhattacharjee18-Oct-14 5:51 
AnswerRe: Need some info Pin
Vikramaditya S Shekhawat17-Aug-15 1:12
MemberVikramaditya S Shekhawat17-Aug-15 1:12 
Questionthanks . for the quick article it helped me Pin
rama charan13-Jul-11 21:34
Memberrama charan13-Jul-11 21:34 
QuestionHelped me with PayPal API Medium Trust Issue! Pin
army_man716559-Jul-11 20:47
Memberarmy_man716559-Jul-11 20:47 
GeneralMy vote of 5 Pin
daylightdj22-Apr-11 4:54
Memberdaylightdj22-Apr-11 4:54 
GeneralMy vote of 5 Pin
olehY0920-Feb-11 21:59
MemberolehY0920-Feb-11 21:59 
GeneralMy vote of 5 Pin
Member 23636832-Jan-11 11:16
MemberMember 23636832-Jan-11 11:16 
GeneralMy vote of 4 Pin
Md. Marufuzzaman9-Nov-10 20:17
professionalMd. Marufuzzaman9-Nov-10 20:17 
GeneralMy vote of 1 Pin
Anuj Tripathi5-Aug-10 20:54
MemberAnuj Tripathi5-Aug-10 20:54 
GeneralRe: My vote of 1 Pin
jeremychild10-Aug-11 17:16
Memberjeremychild10-Aug-11 17:16 
GeneralUser Level Logging Pin
RaMuthusamy26-Nov-09 16:11
MemberRaMuthusamy26-Nov-09 16:11 
GeneralBlank Page Pin
dhaval.upadhyay9-Feb-09 1:17
professionaldhaval.upadhyay9-Feb-09 1:17 
Generallog4net is not working with Access and SQL-Server using ASP.NET Pin
Bimal Kothari13-Aug-08 4:33
MemberBimal Kothari13-Aug-08 4:33 
Generallog4net is not working with Access and SQL-Server Pin
Bimal Kothari13-Aug-08 4:32
MemberBimal Kothari13-Aug-08 4:32 
GeneralNeed log4net Solution and sample for Access and SQL-Server Pin
Bimal Kothari13-Aug-08 4:30
MemberBimal Kothari13-Aug-08 4:30 
GeneralSecurity Exception Pin
Manojkumar Sharma6-Jun-08 0:49
MemberManojkumar Sharma6-Jun-08 0:49 
Generalhi Pin
manoj221849-May-08 2:59
Membermanoj221849-May-08 2:59 
GeneralThanks ! Pin
andy_sinclair1-Nov-07 5:49
Memberandy_sinclair1-Nov-07 5:49 
GeneralThank you, it's helpful! Pin
liuruicai11-Oct-07 16:21
Memberliuruicai11-Oct-07 16:21 
Generalblank file Pin
RADman10-Oct-07 4:26
MemberRADman10-Oct-07 4:26 
GeneralWhere should i add the new section Pin
satyamythily26-Jul-07 6:00
Membersatyamythily26-Jul-07 6:00 
GeneralRe: Where should i add the new section [modified] Pin
Noman Mohammad Tee6-Aug-07 6:33
MemberNoman Mohammad Tee6-Aug-07 6:33 
GeneralNice Pin
nsebastian20-Jun-07 11:47
Membernsebastian20-Jun-07 11:47 
GeneralBest log4net guide I found Pin
reach4thelasers28-May-07 6:57
Memberreach4thelasers28-May-07 6:57 

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