C# Proxy Scraper

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///Proxy Scraper in c# made by Bo\\\
////////////////////////////////////

//This code is for getting the proxies:
WebClient downloader = new WebClient;
        downloader.Encoding = Encoding.UTF8;
        string mystring = downloader.DownloadString("" + TextBox1.Text);
        string myregex = "\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b:\\d{2,5}";
        string source = mystring;
        MatchCollection findme = Regex.Matches(source, myregex);
        foreach (Match mymatch in findme)
        {
            ListBox1.Items.Add(mymatch);
        }

        MsgBox("You scraped total of " + ListBox1.Items.Count.ToString + " proxies!");
    }

//this code is to save the proxies
SaveFileDialog SetSave = new SaveFileDialog;
        int i;
        SetSave.Title = "Save SET.txt";
        SetSave.Filter = "SET.txt File (*.txt)|*.txt";
        if (SetSave.ShowDialog == Windows.Forms.DialogResult.OK)
        {
            IO.StreamWriter s = new IO.StreamWriter(SetSave.FileName, true);
            for (i = 0; i <= ListBox1.Items.Count - 1; i++)
            {
                s.WriteLine(ListBox1.Items.Item(i));
            }

            s.Close();
        }