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Код

using System;
using System.Text;
using System.IO;
using System.Windows.Forms;

namespace дир
{
    public partial class Form1 : Form
    {
        private string currentFolderPath;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        protected void ClearAllFields()
        {
            listBoxFolders.Items.Clear();
            listBoxFiles.Items.Clear();
            txtBoxFolder.Text = "";
        }
        
       protected void DisplayFolderList(string folderFullName) 
        {
            DirectoryInfo TheFolder = new DirectoryInfo(folderFullName);
            ClearAllFields();
            txtBoxFolder.Text = TheFolder.FullName;
            currentFolderPath = TheFolder.FullName;
            foreach (DirectoryInfo NextFolder in TheFolder.GetDirectories())
                listBoxFolders.Items.Add(NextFolder.Name);
            foreach (FileInfo NextFile in TheFolder.GetFiles())
                listBoxFiles.Items.Add(NextFile.Name);
        }

        private void buttonDisplay_Click(object sender, EventArgs e)
        {
            try
            {
                string FolderPath = txtBoxInput.Text;
                DirectoryInfo TheFolder = new DirectoryInfo(FolderPath);
                if (TheFolder.Exists)
                {
                    DisplayFolderList(TheFolder.FullName);
                    return;
                }
                throw new FileNotFoundException("There is no file or Folder with theese name: " + txtBoxInput.Text);
            }
            catch (Exception ex) 
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void listBoxFiles_SelectedIndexChanged(object sender, EventArgs e)
        {
        }

        private void listBoxFolders_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                string SelectedString = listBoxFolders.SelectedItem.ToString();
                string FullPathName = Path.Combine(currentFolderPath, SelectedString);
                DisplayFolderList(FullPathName);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void buttonUp_Click(object sender, EventArgs e)
        {
            try 
            {
                string FolderPath = new FileInfo(currentFolderPath).DirectoryName;
                DisplayFolderList(FolderPath);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void txtBoxInput_TextChanged(object sender, EventArgs e)
        {

        }

        private void txtBoxFolder_TextChanged(object sender, EventArgs e)
        {

        }
    }
}