Do you want *just* the text or do you want to display the text all pretty and formatted?
I need only webpage text. It is like i go to some web page then slect all text (ctrl + a), and copy that text in to notepad. In this case i need that my C# aplication copy that text automatically in to rich textbox.
Here is code that will do what you originally asked. Just set your richTextBox1.Text = webHTMLText;, after running it.
WebClient webClient = new WebClient();
using (MemoryStream ms = new MemoryStream(webClient.DownloadData("http://daniweb.com/")))
using (StreamReader sr = new StreamReader(ms))
webHTMLText = sr.ReadToEnd();
If there is specific text you want from this before you put it into the control's Text, you would need to know exactly what tags to parse it out of.