you can create your own custom event by using diagnostics.Event log class. Open a windows application and on a button click do the following code.
System.Diagnostics.EventLog.CreateEventSource("ApplicationName", "MyNewLog");
"MyNewLog" means the name you want to give to your log in event viewer.
for more information check this link [ http://msdn.microsoft.com/en-in/library/49dwckkz%28v=vs.90%29.aspx]