FolderBrowserDialo demo

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

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

        private void btBrowser_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog dlgFile = new FolderBrowserDialog();

            if (dlgFile.ShowDialog() == DialogResult.OK)
            {
                txtThuMuc.Text = dlgFile.SelectedPath;
            }

        }
    }
}