// (c) 2007 Richard Grimes
// www.grimes.demon.co.uk

using System;
using System.Diagnostics;
using System.Collections.Specialized;

class App
{
   const string sourceName = "Acme_Source";
   const string logName = "TestLog";

   static void Main(string[] args)
   {
      StringCollection sysLogs = new StringCollection();
      sysLogs.AddRange(new string[] {"application", "system", "security"});
      if (args.Length > 0)
      {
         if (EventLog.SourceExists(sourceName))
         {
            string log = EventLog.LogNameFromSourceName(sourceName, ".");
            EventLog.DeleteEventSource(sourceName);
            if (!sysLogs.Contains(log.ToLower()))
            {
               EventLog.Delete(log);
            }
         }
         return;
      }

      if (!EventLog.SourceExists(sourceName))
      {
         EventLog.CreateEventSource(sourceName, logName);
         Console.WriteLine("Event source created - restart application");
         return;
      }

      using (EventLog el = new EventLog())
      {
         el.Source = sourceName;
         el.WriteEntry("Application started", EventLogEntryType.Information, 0, 0);

         Random rand = new Random(Environment.TickCount);
         for (int x = 0; x < 1000; ++x)
         {
            if (rand.Next(1000) < 2)
            {
               el.WriteEntry("Important Message!", EventLogEntryType.Error, 2, 0);
            }
            else
            {
               el.WriteEntry("Trivial Message", EventLogEntryType.Information, 3, 0);
            }
         }

         el.WriteEntry("Application ended", EventLogEntryType.Information, 1, 0);
      }
   }
}