webBrowser获取cookie

private void BtnOpenUrl_Click(object sender, EventArgs e)
        {
            if (txtUrl.Text != "")
            {
                MywebBrowser.Url = new Uri(txtUrl.Text);
            }
        }

        private void BtnGetCookie_Click(object sender, EventArgs e)
        {
            CookieContainer myCookieContainer = new CookieContainer();
            if (MywebBrowser.Document.Cookie != null)
            {
                string cookieStr = MywebBrowser.Document.Cookie;
                string[] cookstr = cookieStr.Split(';');
                foreach (string str in cookstr)
                {
                    string[] cookieNameValue = str.Split('=');
                    Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
                    ck.Domain = "www.google.com";
                    myCookieContainer.Add(ck);
                }
            }
        }