webbrowser如何禁止弹窗

webbrowser如何禁止弹窗试了好多次都不行!这方面的资源还比较少,求高人指点!

private void webBrowser_NewWindow(object sender, CancelEventArgs e)
        {
            e.Cancel = true;
        }
webBrowser.ScriptErrorsSuppressed=false;
IHTMLWindow2 win = (IHTMLWindow2)webBrowser.Document.Window.DomWindow;
string s = "window.alert = null;\r\nwindow.confirm = null;\r\nwindow.open = null;\r\nwindow.showModalDialog = null;";
win.execScript(s, "javascript");
试试