Description for event id from source cannot be found

Question

When I write a log into windows event log, I get the event below, what\'s the root cause of this message, and how can I fix it? Many Thanks

The descri

Answer 1

Improving on the answer by @Alex, I suggest the following:

            using (EventLog eventLog = new EventLog("Application"))
            {
                //You cannot be sure if the current identity has permissions to register the event source.
                try
                {
                    if (System.Web.HttpRuntime.AppDomainAppId != null)
                    {
                        eventLog.Source = System.Web.HttpRuntime.AppDomainAppId;
                    }
                    else
                    {
                        eventLog.Source = Process.GetCurrentProcess().ProcessName;
                    }
                }
                catch (SecurityException)
                {
                    eventLog.Source = "Application";
                }

                eventLog.WriteEntry("Log message example", EventLogEntryType.Information, 1000);
            }

It is important here not to specify category parameter. If you do, and this is the same for the .NET Runtime so-called magic, the

The description for Event ID <...> from source <...> cannot be found.

is going to appear.