Example of how to write to the Windows Event Log.

EventLogger.cs

using System.Diagnostics;
using System.Reflection;

public class EventLogger
{
	#region Constants

	private const string DEFAULT_TYPE = "Application";

	#endregion

	#region Constructors

	public EventLogger(string type, string source)
	{
		LogType = type;
		LogSource = source;

		if (!EventLog.SourceExists(LogSource))
		{
			EventLog.CreateEventSource(LogSource, LogType);
		}
	}

	public EventLogger(string source)
		: this(DEFAULT_TYPE, source)
	{
	}

	public EventLogger()
		: this(DEFAULT_TYPE, Assembly.GetEntryAssembly().GetCustomAttribute<AssemblyTitleAttribute>().Title)
	{
	}

	#endregion

	#region Properties

	public string LogType { get; private set; }

	public string LogSource { get; private set; }

	#endregion

	#region Methods

	public void Log(EventLogEntryType level, string message)
	{
		EventLog.WriteEntry(LogSource, message, level);
	}

	#endregion
}