//取当前webBrowser登录后的Cookie值           [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]        static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref int pcchCookieData, int dwFlags, object lpReserved);        //取出Cookie，当登录后才能取            private static string GetCookieString(string url)        {            // Determine the size of the cookie                  int datasize = 256;            StringBuilder cookieData = new StringBuilder(datasize);            if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))            {                if (datasize < 0)                    return null;                // Allocate stringbuilder large enough to hold the cookie                    cookieData = http://www.mamicode.com/new StringBuilder(datasize);                if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))                    return null;            }            return cookieData.ToString();        }