HTML Parse - Login

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Net;

namespace Parse
{
    public partial class Parser : Form
    {
        public Parser()
        {
            InitializeComponent();
        }

        private void Parser_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            WebClient w = new WebClient();
            string page = w.DownloadString("http://www.swefilmer.com/");
            string name = "alt=\"(.*?)\"";
            foreach(Match match in Regex.Matches(page, name))
                listSerials.Items.Add(match.Groups[1].Value);

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }
    }
}