SobekCM.Global.Application_Error C# (CSharp) Method

        protected void Application_Error(object Sender, EventArgs E)
        {
            // Get the exception
            Exception objErr = Server.GetLastError();
            if (objErr == null)
                return;

            objErr = objErr.GetBaseException();

            try
            {
                // Justs clear the error for a number of common errors, caused by invalid requests to the server
                if ((objErr.Message.IndexOf("potentially dangerous") >= 0) || (objErr.Message.IndexOf("a control with id ") >= 0) || (objErr.Message.IndexOf("Padding is invalid and cannot be removed") >= 0) || (objErr.Message.IndexOf("This is an invalid webresource request") >= 0) ||
                    ((objErr.Message.IndexOf("File") >= 0) && (objErr.Message.IndexOf("does not exist") >= 0)))
                {
                    // Clear the error
                    Server.ClearError();
                }
                else
                {
                    try
                    {
                        StreamWriter writer = new StreamWriter(AppDomain.CurrentDomain.BaseDirectory + "\\temp\\exceptions.txt", true);
                        writer.WriteLine();
                        writer.WriteLine("Error Caught in Application_Error event ( " + DateTime.Now.ToString() + ")");
                        writer.WriteLine("User Host Address: " + Request.UserHostAddress);
                        writer.WriteLine("Requested URL: " + Request.Url);
                        if (objErr is SobekCM_Traced_Exception)
                        {
                            SobekCM_Traced_Exception sobekException = (SobekCM_Traced_Exception)objErr;

                            writer.WriteLine("Error Message: " + sobekException.InnerException.Message);
                            writer.WriteLine("Stack Trace: " + objErr.StackTrace);
                            writer.WriteLine("Error Message:" + sobekException.InnerException.StackTrace);
                            writer.WriteLine();
                            writer.WriteLine(sobekException.Trace_Route);
                        }
                        else
                        {

                            writer.WriteLine("Error Message: " + objErr.Message);
                            writer.WriteLine("Stack Trace: " + objErr.StackTrace);
                        }

                        writer.WriteLine();
                        writer.WriteLine("------------------------------------------------------------------");
                        writer.Flush();
                        writer.Close();
                    }
                    catch (Exception)
                    {
                        // Nothing else to do here.. no other known way to log this error
                    }
                }
            }
            catch (Exception)
            {
                // Nothing else to do here.. no other known way to log this error
            }
            finally
            {
                // Clear the error
                Server.ClearError();

                string error_message = objErr.Message;
                if (objErr is SobekCM_Traced_Exception)
                {
                    SobekCM_Traced_Exception sobekException = (SobekCM_Traced_Exception)objErr;
                    error_message = sobekException.InnerException.Message;

                }

                try
                {
                    if ((HttpContext.Current.Request.UserHostAddress == "127.0.0.1") || (HttpContext.Current.Request.UserHostAddress == HttpContext.Current.Request.ServerVariables["LOCAL_ADDR"]) || (HttpContext.Current.Request.Url.ToString().IndexOf("localhost") >= 0))
                    {
                        Response.Redirect("error_echo.html?text=" + error_message.Replace(" ", "_").Replace("&", "and").Replace("?", ""), false);
                    }
                    else
                    {
                        // Forward if there is a place to forward to.
                        if (!String.IsNullOrEmpty(UI_ApplicationCache_Gateway.Settings.Servers.System_Error_URL))
                        {
                            Response.Redirect(UI_ApplicationCache_Gateway.Settings.Servers.System_Error_URL, false);
                        }
                        else
                        {
                            Response.Redirect("http://ufdc.ufl.edu/sobekcm/missing_config", false);
                        }
                    }
                }
                catch (Exception)
                {
                    // Nothing else to do here.. no other known way to log this error
                }
            }
        }