Which ASP.NET life cycle events fire after HttpApplication.Error?

Question

I want to know which parts of the ASP.NET request life cycle happen after an error is handled via the HttpApplication.Error event. Specifically, which of the events listed at http://msdn.microsoft.com/en-us/library/bb470252.aspx#Stages fire after an error? I know that EndRequest still fires, and I suspect that PreSendRequestHeaders and PreSendRequestContent fire as well, but aside from these I have no idea.

Does it depend on when in the life cycle the error occurs? Does it depend on whether I call Server.ClearError() in the error handler?

I'm asking this question because I don't know if I should be calling HttpApplication.CompleteRequest() from my error handler.

Answer 1

The best way is to catch server last error and appdomain exceptions.

All of them can be done in Global.asax.cs file.

Check the following steps:

1- In Global.asax.cs, catch the last error and log it.

    protected void Application_Error(object sender, EventArgs e)
    {
        Exception exception = Server.GetLastError();
        Server.ClearError();
        log.Error("Application Error caught in Global ", exception);
    }

2- Add an event handler for UnhandledException event on AppDomain, this should be added to the Application_Start :

    protected void Application_Start(object sender, EventArgs e)
    {
        //....
        AppDomain.CurrentDomain.UnhandledException 
              += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
    }       

3- And here is the implementation of CurrentDomain_UnhandledException:

    void CurrentDomain_UnhandledException(object sender, 
                                                   UnhandledExceptionEventArgs e)
    {
      if (e != null)
        log.Error("Domain Unhandled Exception: ", e.ExceptionObject as Exception);
    }

Happy coding :)