using System;

using System.Net;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        WebClient client = new WebClient();

        string url     = "http://download.cms.gov/nppes/NPI_Files.html";

        string rawHtml = client.DownloadString(url);

        Regex fileNames         = new Regex("NPPES_Data_Dissemination([^'\"]+)\\.zip", RegexOptions.IgnoreCase);

        //Match fileNamesMatch  = fileNames.Matches(rawHtml);

​

        foreach (Match fileNameMatch in fileNames.Matches(rawHtml))

        {

            Console.WriteLine(fileNameMatch);

        }

    }

}

​

​