TreeView trong lập trình C# Winform

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

namespace TreeViewGUI
{
    public partial class Form1 : Form
    {
        string path = @"D:\";
        public Form1()
        {
            InitializeComponent();

            //LoadTreeView();

            if (Directory.Exists(path))
            {
                TreeNode root = new TreeNode() { Text = path};
                tvShow.Nodes.Add(root);
                LoadExplorer(root);
            }
        }

        void LoadExplorer(TreeNode root)
        {
            if (root == null)
                return;
            try
            {


                var folderList = new DirectoryInfo(root.Text).GetDirectories();

                if (folderList.Count() == 0)
                    return;

                foreach (DirectoryInfo item in folderList)
                {
                    if (Directory.Exists(item.FullName))
                    {
                        TreeNode node = new TreeNode() { Text = item.FullName };
                        root.Nodes.Add(node);
                        LoadExplorer(node);
                    }
                }
            }
            catch
            {
                return;
            }
        }

        void LoadTreeView()
        {
            tvShow.CheckBoxes = true;
            tvShow.NodeMouseClick += tvShow_NodeMouseClick;

            TreeNode root1 = new TreeNode();
            root1.Text = "Root nè";
            root1.ImageIndex = 0;

            TreeNode node1 = new TreeNode() { Text = "Node 1 nè"};
            root1.Nodes.Add(node1);
            node1.ImageIndex = 1;
            node1.Checked = true;

            TreeNode root2 = new TreeNode();
            root2.Text = "Ứ phải root đâu. à hi hí";
            root2.ImageIndex = 2;

            tvShow.Nodes.Add(root1);
            tvShow.Nodes.Add(root2);
        }

        void tvShow_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            e.Node.Checked = !e.Node.Checked;
        }
    }
}
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namespace TreeViewGUI
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.tvShow = new System.Windows.Forms.TreeView();
            this.imageList1 = new System.Windows.Forms.ImageList(this.components);
            this.SuspendLayout();
            // 
            // tvShow
            // 
            this.tvShow.ImageIndex = 0;
            this.tvShow.ImageList = this.imageList1;
            this.tvShow.Location = new System.Drawing.Point(12, 12);
            this.tvShow.Name = "tvShow";
            this.tvShow.SelectedImageIndex = 0;
            this.tvShow.Size = new System.Drawing.Size(550, 409);
            this.tvShow.TabIndex = 0;
            // 
            // imageList1
            // 
            this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));
            this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
            this.imageList1.Images.SetKeyName(0, "banner - big.png");
            this.imageList1.Images.SetKeyName(1, "big_logo.png");
            this.imageList1.Images.SetKeyName(2, "Kteam-vector copy 2.png");
            this.imageList1.Images.SetKeyName(3, "LogoApp.png");
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(574, 433);
            this.Controls.Add(this.tvShow);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.TreeView tvShow;
        private System.Windows.Forms.ImageList imageList1;

    }
}

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