Folder & File House Keeping

//App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
    </startup>
    <appSettings>
       <add key="targetDirectory" value="C:\temp"/>
       <add key="onSpotDirectory" value="C:\onSpot"/>
       <add key="day" value="5"/>
      </appSettings>
</configuration>

//Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Configuration;

namespace HouseKeeping
{
	public partial class Form1 : Form
	{

		string targetDirectory = ConfigurationManager.AppSettings["targetDirectory"];
		string onSpotDirectory = ConfigurationManager.AppSettings["onSpotDirectory"];
		int delete = int.Parse(ConfigurationManager.AppSettings["day"]);
		public Form1()
		{
			string time = DateTime.Now.AddDays(-delete).ToString("yyyyMMddHHmmss"); 
			InitializeComponent();
			HouseKeeping(time);
		}


		public void HouseKeeping(string strtime)
		{
			try
			{
				//Folder HouseKeeping
				string[] subdirectoryEntries = Directory.GetDirectories(targetDirectory);
				foreach (string subdirectory in subdirectoryEntries)
				{
					string t = Directory.GetCreationTime(subdirectory).ToString("yyyyMMddHHmmsss");
					int result = t.CompareTo(strtime);
					// -1:subdirectory creattime more than "n" days, no need any more;
					// 0,1:subdirectory creattime less than "n" days, should keep
					if (result < 0)
					{
						Directory.Delete(subdirectory, true);
					}
				}

				//File HouseKeeping
				// Process the list of files found in the directory. 
				string[] fileEntries = Directory.GetFiles(onSpotDirectory);
				foreach (string fileName in fileEntries)
				{
					string temptime = Directory.GetCreationTime(fileName).ToString("yyyyMMddHHmmsss");
					int result2 = temptime.CompareTo(strtime);
					if(result2 < 0)
					{
						File.Delete(fileName);
					}
				}
			}
			catch(Exception ex)
			{
				
			}
		}
	}
}