//百度提交了接口,可以自动提交网址,有利于SEO,  http://zhanzhang.baidu.com/linksubmit/index?site=http%3A%2F%2Ftaohao.wangzhan360.com.cn/,
//大致流程,1.登陆百度后台,输入要提交的网址  
//2.下载百度的验证文件,放到要提交的站点  
//3.百度发请求验证这个文件,验证成功,生成一个token  
//4.接下来,参考下面代码,程序发请求,完成提交。
//注意:site参数要是你申请的站点,token是该站点的token,一一对应。
// 测试通过的提交代码如下:

string postData = "http://taohao.wangzhan360.com.cn/Default.aspx";
        string urls = "http://data.zz.baidu.com/urls?site=taohao.wangzhan360.com.cn&token=rzgs6fs1P8hPCXKu";

        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        HttpWebRequest objWebRequest = (HttpWebRequest)WebRequest.Create(urls);
        objWebRequest.Method = "POST";
        objWebRequest.ContentType = "text/plain";
        objWebRequest.Host = "data.zz.baidu.com";
        objWebRequest.UserAgent = "curl/7.12.1";
        objWebRequest.ContentType = "text/plain";
        objWebRequest.ContentLength = byteArray.Length;

        Stream newStream = objWebRequest.GetRequestStream();
        newStream.Write(byteArray, 0, postData.Length); //写入参数
        newStream.Close();
        HttpWebResponse response = (HttpWebResponse)objWebRequest.GetResponse();
        StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default);
        string textResponse = sr.ReadToEnd();
        Response.Write(textResponse);