Introduction:
Here I am Taking one directory "DeleteData" which contains some files. Now I want delete these files after 7 days. So I am using
windows service, this can be automatically deleting files after 7 days. Once you started the service when ever you shutdown your system your
service still running. This service never stopped until your setup uninstalled. You must follow bellow Steps.
  1. First you Create Your windows service
  2. Then write below code
  3. Here I am taking "D:\DeleteData\" this is my directory where files are stored.

    Note: Don't forgot after end of your directory name put ' \ ' in coding.
    string[] Files = Directory.GetFiles(@"D:\DeleteData\");
  4. Do you want MessageBox then add "System.windows.Forms" dll , then write your own message.
  5. Then go to MyComputers right click Manage Services Right Click on your service Name Properties Logon Tab Check on Allow interactive with Desktop.
  6. After Restart your service. Then you getting Messagebox.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.IO;
using System.Windows.Forms;

namespace SEMIS_WindowsService
{
public partial class Service1 : ServiceBase
{
System.Timers.Timer timer;

public Service1()
{
InitializeComponent();
}

protected override void OnStart(string[] args)
{
Deletefile(); // This Method for Deleting files in DeleteData after 7 days.
}
protected void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
Deletefile()
}
public void Deletefile()
{
try
{
timer = new System.Timers.Timer();
timer.Interval = (10000) * 6;
timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
string[] Files = Directory.GetFiles(@"D:\DeleteData\");
for (int i = 0; i < Files.Length; i++)
{
//Here we will find wheter the file is 7 days old
if (DateTime.Now.Subtract(File.GetCreationTime(Files[i])).TotalDays > 7)
{
File.Delete(Files[i]);
MessageBox.Show("File Deleted Successfully");
}
}
timer.Enabled = true;
timer.Start();
}
catch
{
}

}
protected override void OnStop()
{

}
}
}