How To Configure Log4Net Without Modifying Web.Config

Peace be upon you,

I was trying to configure Log4Net without making any modifications to the application web.config and going through the hassle of XML nodes, web.config backup specially if it was for a portal like sharepoint or something, etc.

I found a quick and easy way for such thing, I will illustrate it in steps:

1-      Add this line in your AssemblyInfo.cs file: [assembly: log4net.Config.XmlConfigurator(ConfigFile = “log4net.config”, Watch = true)]

2-      Create a file named by log4net.config and Add this example of configuration inside it:


<appender name=”FileAppender”>

<param name=”File” value=”C:\\tmp\\ log.txt” />

<param name=”AppendToFile” value=”true” />

<param name=”MaximumFileSize” value=”5MB” />

<layout type=”log4net.Layout.PatternLayout,log4net, Version=, Culture=neutral, PublicKeyToken=1b44e1d426115821″>

<param name=”ConversionPattern” value=”%d [%t] %-5p %c [%x] %username – %m%n%newline%newline” />



<appender name=”EventLogAppender” type=”log4net.Appender.EventLogAppender” >

<applicationName value=”Your Application Name” />

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

<conversionPattern value=”%date [%thread] %-5level %logger [%property{NDC}] – %message%newline” />



<root name=”Logger”>

<level value=”ALL” />

<appender-ref ref=”FileAppender” />

<appender-ref ref=”EventLogAppender” />



3-      put it beside web.config file of your web application.

Now you are logging in both, your text file and the event log of the system, Offcourse you can make further configurations for Log4Net but that’s not our topic and that’s just a sample config file.

I find this useful for SharePointers as well, such that you can create your wsp file, deploy it using Sharepoint Solution Installer or even your own MSI installer, and just putting your log4net file in the web application virtual folder and that’s it.

Hope you find this useful 🙂


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