winforms - C# Web Crawler/Parser/Spider -

I am new to C # and WinForms, I want to create a web crawler - a web page Parsing and showing them in a serial form. I do not know how to crawl the bot with a specific hyper-link depth.

So I think I have 2 questions:

1. How to make the bot with crawling, the depth of the specified link?
2. How to show all hyperlinks in sequence?

   PS I would love it to be a code sample.

   P.P.S. 1 button = button is 1; And 1 richtextbox = richTextBox1;

   This is my code: I know that it is very ugly .... (All codes in one button):

     Public partial category form 1: form {Public Form 1 () {Initialization (); } Private Zero Button 1_Click (Object Sender, EventArgs E) {// Declaration HttpWebRequest Request = (HttpWebRequest) WebRequest.Create (url); HttpWebResponse response = (HttpWebResponse) request.GetResponse (); Streamer sr = new streamer (feedback; gatorpansstream ()); Match Me; String second test = @ "((ht) {1} tp [s] ?: //) [-a-gaa-z0- 9 @:% _ \ +. ~ #? And \\] +)"; & Lt; String & gt; SavedUrls = new list & lt; String & gt; (); & Lt; String & gt; Title = new list & lt; String & gt; (); // Visit this URL: string url = UrlTextBox.Text = "http://www.yahoo.com"; If (! (Url.StartsWith ("http: //") || url.StartsWith ("https: //"))) url = "http: //" + url; // scrap hole HTML code: string s = sr.ReadToEnd (); Try (// Get Url: M = Reggae Matches (S, another test, ReggaeAppsance. Ignore Season | Regex option. Compatified, Timespain. Foamseconds (1)); while (m.Success) {savedUrls.Add ( M.Groups [1] .tostring ()); m = m.NextMatch ();} Get the title: match M2 = regesx.match (s, @ "