Trigger a form event without any user input?

using System;
using System.ComponentModel;
using System.Windows.Forms;

public partial class FormMain : Form
{
    private BackgroundWorker backgroundWorker;
    // private YourResultType result;

    public FormMain()
    {
        InitializeComponent();
        backgroundWorker = new BackgroundWorker();
        backgroundWorker.DoWork += DoWork;
        backgroundWorker.RunWorkerCompleted += RunWorkerCompleted;
    }

    protected override void OnShown(EventArgs e)
    {
        base.OnShown(e);
        backgroundWorker.RunWorkerAsync();
    }
    private void DoWork(object sender, DoWorkEventArgs e)
    {
        // Run maintainance code here and save results to local field
        // result = yourResult;
    }
    private void RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        // update GUI here from local field as on the UI thread
        // label.Text = yourResult.Text;
        // restart worker if needed
    }
}

namespace MyNameSpace
{
    public partial class Form1 : Form
    {
        BackgroundWorker bw = new BackgroundWorker();

        public Form1()
        {
            InitializeComponent();
            this.Show();

            //Don't need to support cancellation or monitor progress.
            bw.WorkerSupportsCancellation = false;
            bw.WorkerReportsProgress = false;
        }

        private void bw_DoWork(object sender, DoWorkEventArgs e)
        {
                //Maintenance task code goes here.
        }

        //Not knowing about the Shown event was a huge 
        //missing piece of the puzzle for me.
        private void Form1_Shown(Object sender, EventArgs e)
        {
            //If the following 2 lines aren't present, DoWork 
            //simply won't execute.  This had me stumped for a while.
            //This article helped me a lot: http://tinyurl.com/878nf4x
            this.bw.DoWork += bw_DoWork;
            this.bw.RunWorkerCompleted += bw_RunWorkerCompleted;

            bw.RunWorkerAsync();
        }

        private void bw_RunWorkerCompleted(object sender, _
                                           RunWorkerCompletedEventArgs e)
        {
            //I didn't bother to learn how to use the 'Result' attribute.
            //Looking for this indicator file works fine for me since I have to 
            //lay it down anyway.
            if (File.Exists(successIndicatorFile))
                success();
            else
                failure();
        }