using System; using System.Configuration; using System.IO; using System.Web; namespace SingingEels 
{ 
public class ErrorLogger 
{ 
public static void LogException(Exception ex) { ErrorLoggerSection configInstance = ConfigurationManager.GetSection("WebSiteErrorLogger") as ErrorLoggerSection; if (configInstance != null) { string myDirectory=HttpContext.Current.Server.MapPath(configInstance.LogFilePath + DateTime.Now.Year.ToString()+"/"+ DateTime.Now.Month.ToString()+"/"); string mypath=myDirectory+DateTime.Now.ToShortDateString()+".txt"; if (!Directory.Exists(myDirectory)) { Directory.CreateDirectory(myDirectory); 
} File.AppendAllText(mypath, string.Format("{0:yyyyMMdd_HHmmss} :: {1}{2}{2}", DateTime.Now, ex, Environment.NewLine)); } else { throw new Exception("Could not find section 'ErrorLoggerSection' in the application configuration file."); } } } // Inherit from "ConfigurationSection"
simple enough! public class ErrorLoggerSection : ConfigurationSection { // I only want one property LogFilePath, and I'm // here telling .NET to look for an attribute in the // config file called 'logFilePath' to get the value from. [ConfigurationProperty("logFilePath", IsRequired = true)] public string LogFilePath { get { return (string)base["logFilePath"]; } set { base["logFilePath"] = value; } } } 
}
Web.config
<?xml version="1.0"?> <configuration> <configSections> <section name="WebSiteErrorLogger" type="SingingEels.ErrorLoggerSection"/> </configSections> <WebSiteErrorLogger logFilePath="~/Log/"/> <system.web> <compilation debug="true"/> </system.web> <system.web> <customErrors mode="RemoteOnly" defaultRedirect="~/Error.htm"></customErrors> </system.web> </configuration>
Global.asax
<%@ Application Language="C#" %> <script runat="server"> void Application_Start(object sender, EventArgs e) { // Code that runs on application startup } void Application_End(object sender, EventArgs e) { // Code that runs on application shutdown } void Application_Error(object sender, EventArgs e) { // Code that runs when an unhandled error occurs Exception err = Server.GetLastError().GetBaseException(); SingingEels.ErrorLogger.LogException(err); } void Session_Start(object sender, EventArgs e) { // Code that runs when a new session is started } void Session_End(object sender, EventArgs e) { // Code that runs when a session ends. // Note: The Session_End event is raised only when the sessionstate mode // is set to InProc in the Web.config file. If session mode is set to StateServer // or SQLServer, the event is not raised. } </script>
