Website Investigator

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;
using System.IO.Compression;

namespace QIP_Country_Match
{
    class UpdateDatabase
    {
        string gzFileName;
        System.Net.WebClient w;
        System.Uri url1;

        public UpdateDatabase()
        {
            gzFileName = Environment.GetEnvironmentVariable("TEMP") + "\\IpToCountry.gz";
            w = new System.Net.WebClient();
            url1 = new Uri(@"http://www.software77.net/cgi-bin/ip-country/geo-ip.pl?action=download");
        }

        public void Start()
        {
            ConnectAndDownload();
            UncompressAndExit();
        }

        private void ConnectAndDownload()
        {

       //start downloading
        ConnectAndDownload:
            {
                try
                {
                    w.DownloadFile(url1, gzFileName);
                }
                catch (System.Net.WebException)
                {
                    DialogResult dr = MessageBox.Show("Cannot connect to server!\nYou may not be connected to the internet or the server might be busy at this moment\nYou may need to try later\n\nNote: Our online database is locked everyday for new updates at 12 UTC, so please\nDO NOT attempt to update during this time!", "Error", MessageBoxButtons.RetryCancel);
                    if (dr == DialogResult.Retry)
                        goto ConnectAndDownload;
                    else
                        Application.Exit();
                }
            }
        }

        private void UncompressAndExit()
        {
            UncompressFile();
            System.IO.File.Delete(gzFileName);
        }

        private void UncompressFile()
        {
            try
            {
                FileStream sourceFile = File.OpenRead(gzFileName);
                FileStream destinationFile = File.Create(gzFileName.TrimEnd(".gz".ToCharArray()) + ".csv");

                byte[] buffer = new byte[sourceFile.Length * 100];
                int n;

                using (GZipStream input = new GZipStream(sourceFile,
                    CompressionMode.Decompress, false))
                {


                    n = input.Read(buffer, 0, buffer.Length);
                    destinationFile.Write(buffer, 0, n);
                }

                // Close the files.
                sourceFile.Close();
                destinationFile.Close();
            }
            catch (Exception) { }
        }
    }
}