<configuration>


  <configSections>

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

  </configSections>




  <log4net>

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

      <file value="c:\temp\web.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="ALL" />

      <appender-ref ref="RollingFile" />

    </root>

  </log4net>


 
</configuration>

Imports log4net
Public Class Form1
    Dim log As log4net.ILog
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        log4net.Config.XmlConfigurator.Configure()

        log = log4net.LogManager.GetLogger("MyApp"")

    End Sub

Private Sub cmdDebug_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDebug.Click
         log.Error("'Debug'----komala1")
    End Sub