[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
 public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);

InternetSetCookie("http://"+url, null, cookie);
//屏蔽webBrowser中的脚本错误
webBrowser1.ScriptErrorsSuppressed = true;
 webBrowser1.Navigate(url);