Steps to use apache in error handling

Steps To use Apache log4net in project for error handling

1. The first step for using apache log4net is to download DLL of apache log4net.

You can download it from link http://logging.apache.org/log4net/download.html

2. The second step is to add reference of this DLL in our project where we want to use apache for error handling.
3. The third step is to open the web config and add the following code in the webconfig

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   <log4net>

      <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">

            <file value="D:\anuj.log"/>

            <appendToFile value="true"/>

            <maximumFileSize value="1024KB"/>

            <maxSizeRollBackups value="10"/>

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

        <conversionPattern value="%date %level %logger - %message%newline"/>

      </layout>

    </appender>

    <root>

      <level value="DEBUG"/>

      <appender-ref ref="RollingFile"/>

    </root>

  </log4net>

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 <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">

An appender defines HOW log4Net is going to log application information.

 <appendToFile value="true"/>

Sets a flag that indicates whether the file should be appended to or overwritten. So, for example, if it's set to 'true' and the application is stopped and started, then log4Net will attempt to reuse the same log file.

<maximumFileSize value="1024KB"/>

Sets the maximum size that the log file is allowed to reach before being rolled over to backup files.

<maxSizeRollBackups value="10"/>

Sets the maximum number of backup (rollover) files that are kept before the oldest is erased.

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

        <conversionPattern value="%date %level %logger - %message%newline"/>

      </layout>

Formats the logging event as a string.

<level value="All"/>

Defines the logging level for application events, e.g. ERROR, DEBUG, INFO.

And this code in <configsection>

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

4. The  forth step to add following code in the form

      Imports System.Data

Imports System.Data.SqlClient

Imports System

Imports System.Collections.Generic

      Imports log4net

Imports log4net.Config

Partial Public Class _Default

    Inherits System.Web.UI.Page

    Protected Shared ReadOnly log As ILog = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType)

      Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        log4net.Config.XmlConfigurator.Configure()

        log.Debug("Hello World!")

        log.Info("I'm a simple log4net tutorial.")

        log.Warn("... better be careful ...")

        log.Error("ruh-roh: an error occurred")

        log.Fatal("OMG we're dooooooomed!")       

    End Sub

End Class

We can also confiure error log file in global.asax file.Insted of configring in all the forms

In Case of multiple project In a single soution You just have to add reffrence in that project and create object for log4net.And you can simply use it as in given example

Imports System

Imports System.Data

Imports log4net

Imports log4net.Config

Public Class Class1

    Protected Shared ReadOnly log As ILog = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType)

    Public Sub log4net()

        log.Error("Form1_Load() - ")

        log.Warn("Anuj is great")

        log.Warn("I m In class1 of view")

    End Sub

End Class

This will create error log file in specified loction in Web config