EventSource

using System;
using System.Collections.Generic;
[EventSource(Name = "MyDomain-MyEventSource")]
public class MyEventSource : EventSource
{
   public class Keywords
   {
      public const EventKeywords Database = (EventKeywords)1;
      public const EventKeywords ExternalApi = (EventKeywords)2;
   }

   public class Tasks
   {
      public const EventTask Timing = (EventTask)1;
   }

   [Event(1,
      Message = "Method entry: {0}",
      Level = EventLevel.Verbose)]
   internal void MethodEntry(String message)
   {
      if (IsEnabled()) WriteEvent(1, message);
   }

   [Event(2,
      Message = "External call to {0}/{1} - TimeSpan: {2}",
      Level = EventLevel.Informational,
      Keywords = Keywords.ExternalApi, 
      Task=Tasks.Timing)]
   internal void ApiTiming(String apiName, String apiOperation, Int64 elapsedTimeMilliSeconds)
   {
      if (IsEnabled()) WriteEvent(2, apiName, apiOperation, elapsedTimeMilliSeconds);
   }

   [Event(3,
      Message = "Invalid configuration entry: {0}",
      Level = EventLevel.Warning)]
   internal void MissingConfigurationEntry(String entryName)
   {
      if (IsEnabled()) WriteEvent(3, entryName);
   }

   public static readonly MyEventSource Log = new MyEventSource();
}