Display Files in current Directory

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;
using System.IO;
namespace Display_Files_in_current_Directory
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_Display_Click(object sender, EventArgs e)
        {
        //Get Current Directory path
            string current_directory_path = Application.StartupPath;
// Get Files
            string[] Files = Directory.GetFiles(current_directory_path);
// store files in result variable
            string result="";

            foreach (string file in Files)
                result += ( file + "\n");

            richTextBox1.Text = result;
        }
    }
}