How to Parse HTML with agility pack?

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VB

I have spent all day with little advise and no real progress to try and figure out a way to properly parse a http web request in vb.net.

I have read tutorials but most describe ways to use MSHTML which i find confusing.

This is the code I am using to return the HTML of a requested web page:

Dim input As String = TextBox1.Text
       Dim WebAddress As String = "https://www.google.com/" + input  
       ' Create a request for the URL.
       Dim request As WebRequest = _
         WebRequest.Create(WebAddress)
       ' If required by the server, set the credentials.
       request.Credentials = CredentialCache.DefaultCredentials
       ' Get the response.
       Dim response As WebResponse = request.GetResponse()
       ' Display the status.
       Label20.Text = (CType(response, HttpWebResponse).StatusDescription)
       ' Get the stream containing content returned by the server.
       Dim dataStream As Stream = response.GetResponseStream()
       ' Open the stream using a StreamReader for easy access.
       Dim reader As New StreamReader(dataStream)
       ' Read the content.
       Dim responseFromServer As String = reader.ReadToEnd()
       ' Display the content.
       Label2.Text = WebAddress
       RichTextBox1.Text = responseFromServer
       ' Clean up the streams and the response.
       reader.Close()
       response.Close()

As you can see The Richtextbox1 object is filled with the HTML output but I only wish to obtain and show specific portions of the HTML in given labels or textbox. Many people give the link and talk about the HTML Agility Pack but I have no idea how to pin point the areas of the HTML output in my Rich Textbox1 to do this.

Please if anyone can help with an example or a link that shows how to display selected HTML text from a textbox to a label or another textbox I will await your response.

Thank you in advance