Exception Handling In ASP.NET

Hi,
try to handle exceptions in global.asax file in Application_Error event.

http://support.microsoft.com/kb/306355[^]

http://www.15seconds.com/issue/030102.ht[^]

You can use Log4Net logging mechanism and log your unhandled exceptions in a log file in Global.asax's Application_Error .

Link to Log4Net : Log4Net[^]

protected void Application_Error(object sender, EventArgs e)
       {
           System.Web.HttpContext context = HttpContext.Current;
           Exception ex = context.Server.GetLastError().GetBaseException();


               CLogger.WriteLog(ELogLevel.ERROR, "URL : " + context.Request.Url.ToString()+"\n");

               CLogger.WriteLog(ELogLevel.ERROR, "FILE : " + context.Request.FilePath.ToString()+"\n");

               CLogger.WriteLog(ELogLevel.ERROR, "USER : " + context.User.Identity.Name+"\n");

               CLogger.WriteLog(ELogLevel.ERROR, "MESSAGE : " + ex.Message+"\n");
               CLogger.WriteLog(ELogLevel.ERROR, "SOURCE : " + ex.Source+"\n");
               CLogger.WriteLog(ELogLevel.ERROR, "STACK TRACE : " + ex.StackTrace+"\n");
               CLogger.WriteLog(ELogLevel.ERROR, "INNER EXCEPTION : " + ex.InnerException+"\n");
               CLogger.WriteLog(ELogLevel.ERROR, "---------------------------------------------------------------------------------------------\n");
           }

Implementation of CLogger class :

using log4net;
using log4net.Config;

public static class CLogger
   {
       #region Members
       private static readonly ILog logger = LogManager.GetLogger(typeof(CLogger));

       #endregion

       #region Constructors
       static CLogger()
       {
           XmlConfigurator.Configure();
       }
       #endregion

       #region Methods

       public static void WriteLog(ELogLevel logLevel, String log)
       {
           if (logLevel.Equals(ELogLevel.DEBUG))
           {
               logger.Debug(log);
           }
           else if (logLevel.Equals(ELogLevel.ERROR))
           {
               logger.Error(log);
           }
           else if (logLevel.Equals(ELogLevel.FATAL))
           {
               logger.Fatal(log);
           }
           else if (logLevel.Equals(ELogLevel.INFO))
           {
               logger.Info(log);
           }
           else if (logLevel.Equals(ELogLevel.WARN))
           {
               logger.Warn(log);
           }
       }
       #endregion
   }

You have to add custom section under web.config file based on what kind of logging you are using (XML, SQL Server, Plain text file etc.)

<log4net>
        <appender name="LogFileAppender" type="log4net.Appender.FileAppender">
            <param name="File" value="D:\ApplicationLog.log"/>
            <param name="AppendToFile" value="true"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="Header" value=""/>
                <param name="Footer" value=""/>
                <param name="ConversionPattern" value="%d [%t] %-5p %m%n"/>
            </layout>
        </appender>
        <root>
            <level value="All"/>
            <appender-ref ref="LogFileAppender"/>
        </root>
    </log4net>