Subscribe to Non System (Custom) Events in

Question

I want to raise an event whenever a new log entry is added to a particular event log file in windows event viewer. I am trying to do something similar to what is mentioned here. http://msdn.microsoft.com/en-us/library/bb671202.aspx

Here is my code:

static void Main()
    {
        EventLogWatcher watcher = null;
        try
        {                
            EventLogQuery eventQuery = new EventLogQuery("C:\\Windows\\System32\\winevt\\Logs\\Admin.evtx", PathType.FilePath);                             

            EventLogReader logReader = new EventLogReader(eventQuery);
            DisplayEventAndLogInformation(logReader);// this successfully opens the log and shows all logged events. 
            watcher = new EventLogWatcher(eventQuery);
            watcher.EventRecordWritten +=                       
                    new EventHandler<EventRecordWrittenEventArgs>(SomeEvent);
            watcher.Enabled = true; // here i get an unhandled exception which is as below:                         
        } //exception handling omitted here for conciseness

public static void SomeEvent(Object obj, EventRecordWrittenEventArgs arg){}
public static void DisplayEventAndLogInformation(EventLogReader logReader){}

I cannot use PathType.LogName as this is not a standard system log and it doesn't have a corresponding registry key under

HKLM/System/CurrentControlSet/Services/EventLog

. This code works fine when I use a Logname like "System" or "Application" but it fails when I use their corresponding PathType.FilePath. I want it to work with PathType.FilePath and trigger events whenever a particular query(not mentioned here) is entered into the log. Any inputs on why this code is not working would be great! Why am I getting "channel path inavalid" errors when the DisplayEventAndLogInformation method perfectly works fine?

Exception Message:

System.Diagnostics.Eventing.Reader.EventLogException: The specified channel path is invalid at System.Diagnostics.Eventing.Reader.EventLogException.Throw(Int32 errorCode ) at System.Diagnostics.Eventing.Reader.NativeWrapper.EvtSubscribe(EventLogHand le session, SafeWaitHandle signalEvent, String path, String query, EventLogHandl e bookmark, IntPtr context, IntPtr callback, Int32 flags) at System.Diagnostics.Eventing.Reader.EventLogWatcher.StartSubscribing() at System.Diagnostics.Eventing.Reader.EventLogWatcher.set_Enabled(Boolean val ue) at eventlogreader.Program.Main() in C:\Users\username\documents\visual studio 2010\Projects\eventlogreader\eventlogreader\Program.cs:line 40 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args ) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySec urity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionCo ntext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, C ontextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, C ontextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()