Global.asax

    void Application_Error(object sender, EventArgs e)
    {
          //  Code that runs on application shutdown

        Exception ex = Server.GetLastError().GetBaseException();

         // olusumum tarihini getir
        string dateTime = DateTime.Now.ToLongDateString() + ", at "
                            + DateTime.Now.ToShortTimeString();

        string errorMessage = "Exception generated on " + dateTime;
        // hatanin olustusgu url
        System.Web.HttpContext context = System.Web.HttpContext.Current;
        errorMessage += "\n\n Page location: " + context.Request.RawUrl;      
        errorMessage += "\n\n Message: " + ex.Message;
        errorMessage += "\n\n Source: " + ex.Source;
        errorMessage += "\n\n Method: " + ex.TargetSite;
        errorMessage += "\n\n Stack Trace: \n\n" + ex.StackTrace;
        string from = Configuration.AdminMail;
        string to = Configuration.ErrorMailAddress;
        string subject = " Error Report";
        string body = errorMessage;
        SendMail(from, to, subject, body);
            
        Server.ClearError();
        Response.Redirect("GenericErrorPage.aspx", true);
    }