Internet Magic (Proxy Server) Windows Application

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

namespace internet_magic
{
    public partial class clnt_log : Form
    {
        public clnt_log()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        { 
            string dir = Environment.CurrentDirectory;
             if (!dir.Substring(dir.Length - 1, 1).Equals(@"\"))
                 dir += @"\";
             try
             {
                 FileStream file = new FileStream(dir + "clientlog.txt", FileMode.Open, FileAccess.Read);
                 StreamReader sr = new StreamReader(file);
                 this.clnt.Text = sr.ReadToEnd();
                 sr.Close();
                 file.Close();
             }
             catch
             {
                 MessageBox.Show("File access denied.Check you security settings.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string dir = Environment.CurrentDirectory;
            if (!dir.Substring(dir.Length - 1, 1).Equals(@"\"))
                dir += @"\";
            try
            {
                FileStream file = new FileStream(dir + "clientlog.txt", FileMode.Create);
                file.Close();
            }
            catch
            {
                MessageBox.Show("File access denied.Check you security settings.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void clnt_log_Load(object sender, EventArgs e)
        {
            string dir = Environment.CurrentDirectory;
            if (!dir.Substring(dir.Length - 1, 1).Equals(@"\"))
                dir += @"\";
            try
            {
                FileStream file = new FileStream(dir + "clientlog.txt", FileMode.Open, FileAccess.Read);
                StreamReader sr = new StreamReader(file);
                this.clnt.Text = sr.ReadToEnd();
                sr.Close();
                file.Close();
            }
            catch
            {
                MessageBox.Show("File access denied.Check you security settings.", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

        }
    }
}