DirectorySecurity dSecurity = Directory.GetAccessControl(Dir);
        foreach (FileSystemAccessRule rule in dSecurity.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)))
        {
            if (rule.FileSystemRights == FileSystemRights.Read)
            {
                ad_treeView_trv.Nodes.Add(Dir);
            }
        }

private void Ad_folder_select_btn_Click(object sender, EventArgs e)
    {
        FolderBrowserDialog folderBrowserDialog1 = new FolderBrowserDialog();
        folderBrowserDialog1.SelectedPath = ad_folder_select_txtBox.Text;
        DialogResult drResult = folderBrowserDialog1.ShowDialog();
        if (drResult == System.Windows.Forms.DialogResult.OK)
            ad_folder_select_txtBox.Text = folderBrowserDialog1.SelectedPath;
    }

    private void Ad_folder_load_btn_Click(object sender, EventArgs e)
    {
        // Setting Inital Value of Progress Bar
        ad_progressBar_prg.Value = 0;
        // Clear All Nodes if Already Exists
        ad_treeView_trv.Nodes.Clear();
        ad_toolTip_tlt.ShowAlways = true;
        if (ad_folder_select_txtBox.Text != "" && Directory.Exists(ad_folder_select_txtBox.Text))
            LoadDirectory(ad_folder_select_txtBox.Text);
        else
            MessageBox.Show("Select Directory!!");
    }

    public void LoadDirectory(string Dir)
    {
        DirectoryInfo di = new DirectoryInfo(Dir);
        //Setting ProgressBar Maximum Value
        ad_progressBar_prg.Maximum = Directory.GetFiles(Dir, "*.*", SearchOption.AllDirectories).Length + Directory.GetDirectories(Dir, "**", SearchOption.AllDirectories).Length;
        TreeNode tds = ad_treeView_trv.Nodes.Add(di.Name);
        tds.Tag = di.FullName;
        tds.StateImageIndex = 0;
        LoadFiles(Dir, tds);
        LoadSubDirectories(Dir, tds);
        DirectorySecurity dSecurity = Directory.GetAccessControl(Dir);
        foreach (FileSystemAccessRule rule in dSecurity.GetAccessRules(true, true, typeof(System.Security.Principal.NTAccount)))
        {
            if (rule.FileSystemRights == FileSystemRights.Read)
            {
                ad_treeView_trv.Nodes.Add(Dir);
            }
        }
    }

    private void LoadSubDirectories(string dir, TreeNode td)
    {
        // Get all subdirectories
        string[] subdirectoryEntries = Directory.GetDirectories(dir);
        // Loop through them to see if they have any other subdirectories
        foreach (string subdirectory in subdirectoryEntries)
        {

            DirectoryInfo di = new DirectoryInfo(subdirectory);
            TreeNode tds = td.Nodes.Add(di.Name);
            tds.StateImageIndex = 0;
            tds.Tag = di.FullName;
            LoadFiles(subdirectory, tds);
            LoadSubDirectories(subdirectory, tds);
            UpdateProgress();

        }
    }

    private void LoadFiles(string dir, TreeNode td)
    {
        string[] Files = Directory.GetFiles(dir, "*.*");

        // Loop through them to see files
        foreach (string file in Files)
        {
            FileInfo fi = new FileInfo(file);
            TreeNode tds = td.Nodes.Add(fi.Name);
            tds.Tag = fi.FullName;
            tds.StateImageIndex = 1;
            UpdateProgress();

        }
    }

    private void UpdateProgress()
    {
        if (ad_progressBar_prg.Value < ad_progressBar_prg.Maximum)
        {
            ad_progressBar_prg.Value++;
            int percent = (int)(((double)ad_progressBar_prg.Value / (double)ad_progressBar_prg.Maximum) * 100);
            ad_progressBar_prg.CreateGraphics().DrawString(percent.ToString() + "%", new Font("Arial", (float)8.25, FontStyle.Regular), Brushes.Black, new PointF(ad_progressBar_prg.Width / 2 - 10, ad_progressBar_prg.Height / 2 - 7));

            Application.DoEvents();
        }
    }

}
}