In your button click event include

response.redirect(page.aspx?id=1) for login

response.redirect(page.aspx?id=2) for password change

In your new page, on pageload get the query string value by:

If Request.Params.Get("id") <> "" Then
id = Request.QueryString("id")
Else
id = 0
End If

if id=1 then

--display login view

elseif id=2 then

--display forgot password view

Hope this helps.