asp.net(c#)做一个网页数据采集工具

最近做一个网站，该网站需要添加4000多 产品信息，如果用人工方法去别的网站copy那至少要花费半月时间才能完成，所以我个办法使用c#作出来了一个网页数据采集软件
详细出处参考：http://www.jb51.net/article/21468.htm
//提取产品列表页中产品最终页的网页
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Trim() == "" || textBox2.Text.Trim() == "")
{
MessageBox.Show("网址和域名不能为空！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
try
{
string Html = inc.GetHtml("http://study.pctoday.net.cn");
//ArrayList al = inc.GetMatchesStr(Html, "<a[^>]*?>.*?</a>");
ArrayList al = inc.GetMatchesStr(Html, @"href\s*=\s*(?:[\'\""\s](?<1>[^\""\']*)[\'\""])");//提取链接
" title="Replica Watches:">Replica Watches Buy Full Quality Popular Luxury Watches at Amazing Price, Your One Stop Discount Swiss Watches StoreExclusive Replica Rolex Watches, Tag Heuer Watches Replica, Cartier Watches online Sale!
StringBuilder sb = new StringBuilder();
foreach (object var in al)
{
string a = var.ToString().Replace("\"", "").Replace("'", "");
a = Regex.Replace(a, "href=", "", RegexOptions.IgnoreCase | RegexOptions.Multiline);
if (a.StartsWith("/"))
a = textBox2.Text.Trim() + a;
if (!a.StartsWith("http://"))
a = "http://" + a;
sb.Append(a + "\r\n");
}
textBox5.Text = sb.ToString();//把提取到网址输出到一个textBox，每个链接占一行
MessageBox.Show("共提取" + al.Count.ToString() + "个链接", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception err)
{
MessageBox.Show("提取出错！原因：" + err.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
//把采集的产品页面html代码进行字符串处理，提取需要的代码，最后保存到本地一个access数据库中，同时提取产品图片地址并自动现在图片到本地images文件夹下
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//填充产品表
Database.ExecuteNonQuery("delete from Tb_Product