Multithreaded File/Folder Finder

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace FileFind
{
    public partial class DiskFileFilterLists : Form
    {
        private ConfigInfo configInfo;
        private FilterLists filterLists;
        private const string ILLEGALCHARACTERFOUND = "Selection characters (asterisk and question mark) are not allowed";

        private Point formLocation = new Point(0, 0);
        private bool formLocationSet = false;
        public Point FormLocation
        {
            get { return formLocation; }
            set { formLocation = value; formLocationSet = true; }
        }

        public DiskFileFilterLists()
        { InitializeComponent(); }

        private void DiskFileFilterLists_Load(object sender, EventArgs e)
        {
            if (formLocationSet)
                this.Location = formLocation;
            configInfo = new ConfigInfo();
            this.Font = configInfo.UseFont;
            this.Text = configInfo.ProductName + " - " + this.Text;
            label1.Text = "";
            richTextBox1.Clear();
            richTextBox1.AppendText("Select a 'filter list' to use by double clicking the list name");
            richTextBox1.AppendText(" or single click a list name and select an action.");
            filterLists = configInfo.GetFilterLists;
            PopulateListBox1();
            Application.Idle += new System.EventHandler(OnIdle);
        } //ends private void DiskFileFilterLists_Load(...

        private void OnIdle(Object sender, EventArgs e)
        {
            if (0 == filterLists.Count)
            {
                label1.Text = "No stored filter lists were found; you must create a new one.";
                ViewButton.Enabled =
                EditButton.Enabled =
                DeleteButton.Enabled = false;
            }
            else
            {
                ViewButton.Enabled =
                EditButton.Enabled =
                DeleteButton.Enabled = true;
            }
        }

        private void PopulateListBox1()
        {
            listBox1.Items.Clear();
            if (null != (filterLists = configInfo.GetFilterLists))
            {
                FilterList inUseFilterList = filterLists.GetInUse();
                if (null == inUseFilterList)
                    label1.Text = "No filter list is currently in use.";
                else
                    label1.Text = "Filter list currently in use: " + inUseFilterList.Name;
                listBox1.BeginUpdate();
                foreach (FilterList filterList in filterLists)
                    listBox1.Items.Add(filterList.Name);
                listBox1.EndUpdate();
            }
        } //ends private void PopulateListBox1()

        private void cancelButton_Click(object sender, EventArgs e)
        {   //Cancel all changes
            this.DialogResult = DialogResult.Cancel;
            this.Close();
        }

        private void OkButton_Click(object sender, EventArgs e)
        {   //Pass back the selection, if any
            this.DialogResult = DialogResult.OK;
            this.Close();
        }

        private void DeleteButton_Click(object sender, EventArgs e)
        {
            if (0 == listBox1.SelectedItems.Count)
            {
                label1.Text = "You must select a filter list name";
                return;
            }
            if (listBox1.SelectedItems.Count > 1)
            {
                label1.Text = "You may select only one filter list name";
                return;
            }
            string selectedName = listBox1.SelectedItem.ToString();
            filterLists.Remove(selectedName);
            listBox1.Items.Remove(listBox1.SelectedItem);
        }

        private void NewButton_Click(object sender, EventArgs e)
        {
            NewEditFilter newEditFilter = new NewEditFilter();
            newEditFilter.FormLocation = this.Location;
            this.Visible = false;
            newEditFilter.ShowDialog();
            if (DialogResult.OK == newEditFilter.DialogResult)
            {
                label1.Text = "Created new filter list";
                PopulateListBox1();
            }
            this.Visible = true;
        }

        private void EditButton_Click(object sender, EventArgs e)
        {
            switch (listBox1.SelectedItems.Count)
            {
                case 0:
                    label1.Text = "You must select a filter list name";
                    break;
                case 1:
                    string selectedName = listBox1.SelectedItem.ToString();
                    NewEditFilter newEditFilter = new NewEditFilter();
                    newEditFilter.FormLocation = this.Location;
                    newEditFilter.FilterName = selectedName;
                    newEditFilter.ShowDialog();
                    if (DialogResult.OK == newEditFilter.DialogResult)
                    {
                        label1.Text = "Filter list was saved";
                        PopulateListBox1();
                    }
                    else
                        label1.Text = "";
                    break;
                default:
                    label1.Text = "You may select only one filter list name";
                    break;
            }
        }

        private void ViewButton_Click(object sender, EventArgs e)
        {
            label1.Text = "Not coded";
        }

    }
}