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

namespace WindowsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            DirectoryInfo dirinfo = new DirectoryInfo(@"D:\");
            TreeNode root = new TreeNode(dirinfo.FullName );
            treeView1.Nodes.Add(root);
            long size = GetDir(root,dirinfo);
     
        }

        private static long GetDir(TreeNode tree ,DirectoryInfo  dirpath)
        {
            long totalsize=0;
            TreeNode rootnode = tree ;
            FileInfo[] fileinfos = dirpath.GetFiles();
            foreach (FileInfo fileinfo in fileinfos)
            {
                String str1,str2;
                str1 = fileinfo.Name  ;
                str2 = str1 + "==>" + fileinfo.Length +"  bytes" ;
                rootnode.Nodes.Add(str2 );
                totalsize += fileinfo.Length;

            }
            DirectoryInfo dirlist = new DirectoryInfo(tree.FullPath  );
            DirectoryInfo[] tempdir = dirlist.GetDirectories();
            foreach (DirectoryInfo dir in tempdir)
            {
                rootnode = new TreeNode(dir.Name );
                tree.Nodes.Add(rootnode );
                totalsize += GetDir(rootnode, dir);
            }
            return totalsize;
        }

     }
}