axWebBrowser 控件post内容~~~~~~~~~~~

            object o = null;
            object o1 = System.Text.Encoding.ASCII.GetBytes("product=mail&u=dsfghfgh&psw=sdf3&登录=UrlDecode('登录')");

            object o2 = "Content-Type: application/x-www-form-urlencoded\r\n";  //必须要加的

            axWebBrowser1.Navigate("http://mail.sina.com.cn/cgi-bin/login.cgi", ref o, ref o, ref o1, ref o2);