vb.net - ScriptManager is not declared - err msg -

i've class , gave me error name 'scriptmanager not declared'

public notinheritable class responsehelper private sub new() end sub public shared sub redirect(byval response httpresponse, byval url string, byval target string, byval windowfeatures string)     if ([string].isnullorempty(target) orelse target.equals("_self", stringcomparison.ordinalignorecase)) andalso [string].isnullorempty(windowfeatures)         response.redirect(url)     else         dim page page = directcast(httpcontext.current.handler, page)         if page nothing             throw new invalidoperationexception("cannot redirect new window outside page context.")         end if         url = page.resolveclienturl(url)         dim script string         if not [string].isnullorempty(windowfeatures)             script = "window.open(""{0}"", ""{1}"", ""{2}"");"         else             script = "window.open(""{0}"", ""{1}"");"         end if         script = [string].format(script, url, target, windowfeatures)         scriptmanager.registerstartupscript(page, gettype(page), "redirect", script, true)     end if end sub  

end class

this code link:
http://weblogs.asp.net/infinitiesloop/archive/2007/09/25/response-redirect-into-a-new-window-with-extension-methods.aspx

i've been 8 hours trying figure out how open new page , send parameters it. , found code , , 6 hours trying apply nothing.

thanks.

you need ajax installed access scriptmanager. use page.clientscript.registerstartupscript instead. if want solution works whether ajax available or not, have at link.