Csharp/CSharp Tutorial/Windows/EventLog

Add entry to event log inside a service

using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
public class Service1 : System.ServiceProcess.ServiceBase
{
  public Service1()
  {
    this.ServiceName = "MyFirstService";
  }
  static void Main()
  {
    System.ServiceProcess.ServiceBase[] ServicesToRun;
    ServicesToRun = new System.ServiceProcess.ServiceBase[] { new Service1() };
    System.ServiceProcess.ServiceBase.Run(ServicesToRun);
  }
  protected override void OnStart(string[] args)
  {
    EventLog.WriteEntry( "Hello from MyFirstService" );
  }
  protected override void OnStop()
  {
    EventLog.WriteEntry( "Goodbye from MyFirstService" );
  }
}

Create event source and write an event to the event log

using System;
using System.Diagnostics;
class MainClass
{
    public static void Main () 
    {
        if (!EventLog.SourceExists("MyEventSource")) 
        {
            EventLog.CreateEventSource("MyEventSource", "Application");
        }
        // Write an event to the event log.
        EventLog.WriteEntry(
            "MyEventSource",               // Registered event source
            "A simple test event.",        // Event entry message
            EventLogEntryType.Information, // Event type
            1,                             // Application specific ID
            0,                             // Application specific category
            new byte[] {10, 55, 200}       // Event data
        );
    }
}

Display First 5 Entries in your system Event log

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.Win32;
using System.Diagnostics;
public class MainClass{
   public static void Main(){
    EventLog log = new EventLog();
    for(int i = 0; i < 5; i++)
    {
      try
      {
        Console.WriteLine("Message: " + log.Entries[i].Message + "\n" +  
          "Box: " + log.Entries[i].MachineName + "\n" +
          "App: " + log.Entries[i].Source + "\n" +
          "Time entered: " + log.Entries[i].TimeWritten);
      }
      catch{}
    }
    log.Close();
   }
}

Is a event source in the event log

using System;
using System.Collections;
using System.ruponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
public class Service1 : System.ServiceProcess.ServiceBase
{
    private System.Diagnostics.EventLog eventLog1;
    public Service1()
    {
        this.eventLog1 = new System.Diagnostics.EventLog();
        ((System.ruponentModel.ISupportInitialize)(this.eventLog1)).BeginInit();
        this.eventLog1.Log = "MyCustomLog";
        this.eventLog1.Source = "CustomEventService2";
        this.AutoLog = false;
        this.ServiceName = "CustomEventService";
        ((System.ruponentModel.ISupportInitialize)(this.eventLog1)).EndInit();
    }
    // The main entry point for the process
    static void Main()
    {
        System.ServiceProcess.ServiceBase[] ServicesToRun;
        ServicesToRun = new System.ServiceProcess.ServiceBase[] { new Service1() };
        System.ServiceProcess.ServiceBase.Run(ServicesToRun);
    }
    protected override void OnStart(string[] args)
    {
        if ( !EventLog.SourceExists( eventLog1.Source ) )
        {
            EventLog.CreateEventSource( eventLog1.Source, eventLog1.Log );
        }
        eventLog1.WriteEntry( "Hello", EventLogEntryType.Information );
    }
    protected override void OnStop()
    {
        eventLog1.WriteEntry( "Goodbye", EventLogEntryType.Warning );
    }
}

Write entry to event log

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.Win32;
using System.Diagnostics;
public class MainClass{
   public static void Main(){
    EventLog log = new EventLog();
    log.Log = "Application";
    log.Source = "MainClass";
    log.WriteEntry("Hey");
    log.Close();
   }
}