All,

I've read Ismail's and Matt's blogs and I still cannot get this to work.

http://blog.mattbrailsford.com/2010/07/11/registering-an-application-start-event-handler-in-umbraco/
http://ismailmayat.wordpress.com/2009/05/19/integrating-log4net-into-umbraco-site/

Here's the code:

    public class corHandleErrors:umbraco.Global
    {
        public corHandleErrors()
        {
        
        }

        protected override void Application_Error(object sender, EventArgs e)
        {
            //Email Web Admin and get the referrer
            string referringPage = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_REFERER"];
            Exception ex = Server.GetLastError();
            Log.Add(LogTypes.Custom, -1,String.Format("StackTrace is: {0} | Inner Exception is: {1}", ex.StackTrace, ex.InnerException));

            SmtpClient oClient = new SmtpClient();
            MailMessage message = new MailMessage();

            message.To.Add(new MailAddress("xxx"));
            message.From = new MailAddress("xxx");
            message.Subject = "UMB 4.5.2 Error";
            message.Body = String.Format("Stacktrace: {0} | InnerException: {1}", ex.StackTrace, ex.InnerException);

            oClient.Send(message);

            base.Application_Error(sender, e);
        }
    }

I've removed the App_global.asax.dll.  Am I missing something?