Simple MC Account Generator

using System;
using System.Net;
using System. IO;
using System.Text.RegularExpressions;
using System.Collections.Generic;

internal static class Program
{

    private static WebClient client = new WebClient();
    private static List<string> generatedAccs = new List<string>();
    public static void Main()
    {
        Console.Title = "Minecraft account generator - by Raydenman from mpgh.net";
        Console.Write("Number of accounts to generate: ");
        string number = Console.ReadLine();
        if (IsNumeric(number) != true)
        {
            // Not a number ...
            Main();
            return;
        }

        for (var i = 0; i < Convert.ToInt32(number); i++)
        {
            Console.WriteLine(genAcc());
        }
        Console.WriteLine();
        Console.WriteLine(number + " accounts generated successfully!");
        Console.Write("Would you like to save them in a text file on your Desktop? (y/n) ");
        string reply = Console.ReadLine();
        if (reply.ToLower() == "y")
        {
            SaveToTextFile();
        }
    }

    public static string genAcc()
    {
        try
        {
            string strpage = client.DownloadString("http://minecraftoriginal.com.br/gerador/J3S984MSjrT92sSA.php");
            MatchCollection mc = Regex.Matches(strpage, "([A-Za-z0-9_.+-])+@[A-Za-z-0-9]+\\.[a-za-z0-9]{2,10}:[A-Za-z0-9]{3,}");
            generatedAccs.Add(mc[0].ToString());
            return mc[0].ToString();
        }
        catch
        {
            return genAcc();
        }
    }

    public static void SaveToTextFile()
    {
        if (!(File.Exists(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\MinecraftAccounts.txt")))
        {
            File.Create(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\MinecraftAccounts.txt").Dispose();
        }

        for (var i = 0; i < generatedAccs.Count; i++)
        {
            StreamWriter sw = new StreamWriter(Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + "\\MinecraftAccounts.txt", true);
            sw.WriteLine(generatedAccs[i] + Environment.NewLine);
            sw.Close();
        }
    }

    public static bool IsNumeric(object Expression)
    {
        double retNum;

        bool isNum = Double.TryParse(Convert.ToString(Expression), System.Globalization.NumberStyles.Any, System.Globalization.NumberFormatInfo.InvariantInfo, out retNum);
        return isNum;
    }
}