Log4Net + SSIS = Log4SSIS

SSISLogProvider.cs

using System;
using log4net;
using Microsoft.SqlServer.Dts.Runtime;

namespace Log4SSIS
{
    public class SSISLogProvider : LogProviderBase
    {
        protected ILog _Log = LogManager.GetLogger("SSIS");

        public override void OpenLog()
        {
            _Log.Debug("Opening logger");
        }

        public override void Log(string logEntryName, string computerName, string operatorName, string sourceName, string sourceID, string executionID, string messageText, DateTime startTime, DateTime endTime, int dataCode, byte[] dataBytes)
        {
            if (!string.IsNullOrEmpty(messageText))
            {
                string logMessage = string.Format("{0}: {1} ({2})", sourceName, messageText, logEntryName);
                switch (logEntryName)
                {
                    case "OnPreExecute":
                    case "OnPostExecute":
                    case "OnPreValidate":
                    case "OnPostValidate":
                        _Log.Debug(logMessage);
                        break;
                    case "OnWarning":
                        _Log.Warn(logMessage);
                        break;
                    case "OnError":
                        _Log.Error(logMessage);
                        break;
                    default:
                        _Log.Info(logMessage);
                        break;
                }
            }
        }

        public override void CloseLog()
        {
            _Log.Debug("Closing logger");
        }

        public override DTSExecResult Validate(IDTSInfoEvents events)
        {
            _Log.Debug("Validating");
            return DTSExecResult.Success;
        }
    }
}

TestProgram.cs

using Microsoft.SqlServer.Dts.Runtime;

namespace Log4SSIS
{
    class TestProgram
    {
        static void Main(string[] args)
        {
            log4net.Config.XmlConfigurator.Configure();
            Application app = new Application();

            Package package = app.LoadPackage("YOUR_PACKAGE_HERE.dtsx", null);

            package.LoggingOptions.EventFilterKind = DTSEventFilterKind.Inclusion;
            LogProvider log = package.LogProviders.Add(typeof(SSISLogProvider).AssemblyQualifiedName);
            package.LoggingOptions.SelectedLogProviders.Add(log);
            package.LoggingMode = DTSLoggingMode.Enabled;

            package.Execute();
        }
    }
}

I also want to use Log4Net for SSIS logging, could you please let me know where to keep TestProgram.cs file?