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/// <summary>
/// method for extracting all URL's from the data being
/// passed to the method. The data being passed will be all
/// the data from a provided URL
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public ArrayList ExtractLinks(string str)
{
    try
    {
        //ArrayList to hold all the links
        ArrayList linksList = new ArrayList();

        //regex pattern for searching
        string pattern = "href=\"[a-zA-Z./:&\\d_-]+\"";

        //create a new RegEx object
        Regex reg = new Regex(pattern, RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture);

        //put all the matches into a MatchCollection
        MatchCollection matches = reg.Matches(str);

        //loop through all the matches
        foreach (Match match in matches)
        {
            foreach (Group group in match.Groups)
            {
                //now we do some string manipulation to pull the "href=" off the link
                string url = group.Value.Replace("href=\"", "");
                url = url.Substring(0, url.IndexOf("\""));

                //add the URL to the list
                linksList.Add(url);

            }
        }

        //now return the populated ArrayList
        return linksList;
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
        return null;
    }
}