Writing to system32 folder

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

namespace ee_Write_to_System32
{
    public partial class Form1 : Form
    {
        string filePath = System.Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\Test\testreport.reg";
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string folderPath = Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\Test";
            Directory.CreateDirectory(folderPath);
            
            FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);

            StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
            sw.WriteLine(textBox1.Text);

            if (File.Exists(filePath))
            {
                MessageBox.Show("Wow! File created");
            }

            sw.Close();
            fs.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (File.Exists(filePath))
            {
                StreamReader sr= File.OpenText(filePath);

                while (sr.Peek()!=-1)
                {
                    textBox2.Text = sr.ReadLine();
                }

                sr.Close();
            }
        }
    }
}

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