Geckofx closing and reopening in c# -

what needed : need close , reopen browser, i've tried couple of things. winform, c#.

what i've tried :

            using (viewer = new geckowebbrowser())             {                 viewer.dock = dockstyle.bottom;                 viewer.size = new size(217, 257);                 viewer.location = new point(0, 90);                 viewer.enabled = true;                 viewer.visible = true;                 xpcom.initialize("xulrunner");                 geckopreferences.user["browser.xul.error_pages.enabled"] = false;                 geckopreferences.user["security.enable_ssl2"] = true;                 geckopreferences.user["security.default_personal_cert"] = "ask never";                 geckopreferences.user["security.warn_entering_weak"] = true;                 geckopreferences.user["security.warn_viewing_mixed"] = true;                 geckopreferences.user["dom.disable_open_during_load"] = true;                 geckopreferences.user["dom.allow_scripts_to_close_windows"] = true;                 geckopreferences.user["dom.popup_maximum"] = 0;                 geckopreferences.user["dom.max_script_run_time"] = 0;                 geckopreferences.user["extensions.blocklist.enabled"] = false;                 viewer.bringtofront();                 viewer.navigate("http://google.com");                 viewer.dispose();             } 

what problem?

it isn't showing on winform window.

also tried windows control in winform , using viewer.dispose(); destroyed control , wasn't able access more.