از این کلاس معمولا جهت Log کردن عملیات یک برنامه استفاده میشود.
(برای مشاهده آن به Event Viewer ویندوز مراجعه نمایید)

using System.Diagnostics;
// Create the source, if it does not already exist.

if(!EventLog.SourceExists("MySource"))

{

     //An event log source should not be created and immediately used.

     //There is a latency time to enable the source, it should be created

     //prior to executing the application that uses the source.

     //Execute this sample a second time to use the new source.

    EventLog.CreateEventSource("MySource", "MyNewLog");

    Console.WriteLine("CreatedEventSource");

    Console.WriteLine("Exiting, execute the application a second time to use the source.");

    // The source is created.  Exit the application to allow it to be registered.

    return;

}



// Create an EventLog instance and assign its source.

EventLog myLog = new EventLog();

myLog.Source = "MySource";



// Write an informational entry to the event log.    

myLog.WriteEntry("Writing to event log.");
منبع : http://msdn2.microsoft.com/en-us/lib....eventlog.aspx