ASP.NET 提交表单方式发送手机短信

        string FormURL = "http://10.45.19.80:8080/easysendok.jsp";
        //表单需要提交的参数
        //sendobj 参数为接收对象（手机用户）；sendText为短信内容 
        string FormData = " user_id1 =12312&password=123&login_name=test&user_name=12312&destaddr=" + sendobj + "&userdata=" + sendText + "";  //根据你的实际情况，分析post 表单即可。
       Encoding encoding =Encoding.GetEncoding("GBK");//用GBK编码方式，不然发送短信不支持中文
       byte[] data = encoding.GetBytes(FormData);
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(FormURL);
        //数据提交方式
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = data.Length;
        request.ContentLength = FormData.Length;
        request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows Server2003 R2; SV1; .NET version 2.0.50727)";//模拟一个UserAgent
        Stream newStream = request.GetRequestStream();
        newStream.Write(data, 0, data.Length);
        newStream.Close();
         HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        string header = response.ResponseUri.ToString();//取得返回URL
        if (header.IndexOf("false") >= 0)