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    copied!<p>Heres example for log4net:<br /></p> <ol> <li>Create a new console project called Log4NetTest<br /></li> <li>Add log4net [1.2.13] nuget package into project<br /></li> <li><p>Write following program:<br /></p> <pre><code>using System.Threading.Tasks; using log4net; using System.Text; using System.CollectionsGeneric; using System; namespace Log4NetTest { class Program { private static readonly ILog _logger = LogManager.GetLogger("testApp.LoggingExample"); static void Main(string[] args) { // Configure from App.config. This is marked as obsolete so you can also add config into separate config file // and use log4net.Config.XmlConfigurator method to configure from xml file. log4net.Config.DOMConfigurator.Configure(); _logger.Debug("Shows only at debug"); _logger.Warn("Shows only at warn"); _logger.Error("Shows only at error"); Console.ReadKey(); } } } </code></pre></li> <li><p>Change your app.config to following:<br /></p> <pre><code>&lt;!-- language: xml --&gt; &lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;configuration&gt; &lt;configSections&gt; &lt;section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" /&gt; &lt;/configSections&gt; &lt;startup&gt; &lt;supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /&gt; &lt;/startup&gt; &lt;log4net debug="false"&gt; &lt;appender name="LogFileAppender" type="log4net.Appender.FileAppender,log4net" &gt; &lt;param name="File" value="myLog.log" /&gt; &lt;param name="AppendToFile" value="true" /&gt; &lt;layout type="log4net.Layout.PatternLayout,log4net"&gt; &lt;param name="ConversionPattern" value="%date [%thread] %-5level %logger %ndc - %message%newline" /&gt; &lt;/layout&gt; &lt;/appender&gt; &lt;root&gt; &lt;priority value="ALL" /&gt; &lt;appender-ref ref="LogFileAppender" /&gt; &lt;/root&gt; &lt;category name="testApp.LoggingExample"&gt; &lt;priority value="ALL" /&gt; &lt;/category&gt; &lt;/log4net&gt; &lt;/configuration&gt; </code></pre></li> </ol> <p>5.Run application and you should find following file from bin\Debug folder:</p> <pre><code>2013-12-13 13:27:27,252 [8] DEBUG testApp.LoggingExample (null) - Shows only at debug 2013-12-13 13:27:27,280 [8] WARN testApp.LoggingExample (null) - Shows only at warn 2013-12-13 13:27:27,282 [8] ERROR testApp.LoggingExample (null) - Shows only at error </code></pre>
 

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