C# Custom Action

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Deployment.WindowsInstaller;

namespace SetupCAInstallFolder
{
    public class CustomActions
	{

		[CustomAction]
		public static ActionResult InstallFolderFinder(Session session)
		{
            session.Log("Here is the SetupCAInstallFolder");
            string path = session.CustomActionData["INSTALLEDPATH"];
            session.Log("Original Installed Path is " + path);
            path = path.Replace(@"\", @"\\");
            session.Log("New Installed Path is " + path);
            try
            {
                System.IO.Directory.CreateDirectory("C:\\tempdir");
            }
            catch (Exception e)
            {
                session.Log(e.ToString());
            }
            System.IO.File.WriteAllText("C:\\tempdir\\" + "installed.txt", path);
            session.Log("Written in the file OK");
			return ActionResult.Success;
		}

	}
}