[RESOLVED] get selected text from webbrowser1

[new1]

i'm useing WebBrowser1 and the code i use to get the text is

Dim docx As HtmlDocument = WebBrowser1.Document
        Dim readme As Object = Nothing
docx.ExecCommand("copy", True, readme)

i want to make richtextbox that retrieve the selected text without the copy paste method.i want it to be sensitive to the mouse click so it can retrieve the selected text. can some one help me with the code