C # Mass SMS

In the program that sends the text message, we add using System.Net in the code editing area, namespace.

   private string url =  "http://utf8.sms.webchinese.cn/";         //private string URL =  "HTTP +/ Utf8.sms.webchinese.cn/? uid=xiaokai&key=&smsmob= mobile phone number &smstext= SMS content ";         private  string strUid =  "Uid=";        //private  string strkey =  "&key=8df38a399aa3bb8f632f";         private string strKey =  "&key=";         private string strmob =  "&smsmob=";         private string strcontent =  "&smstext=";  /// <summary>         ///  Mass Message         ///  </summary>         /// <param name= "url" >         ///  given an explicit address (including phone, username, secret key)         /// < /param>        /// <returns>     The     ///  return value is used to determine whether the send succeeded         /// </ Returns>        public string gethtmlfromurl (string  URL)         {             string strRet = null;             if  (url == null | |  url. Trim (). ToString ()  ==  "")             {                 return strret;             }            string targeturl =  url. Trim (). ToString ();            try             {                 HttpWebRequest hr =  (HttpWebRequest) WebRequest.Create ( TargetUrl);                 hr. useragent =  "mozilla/4.0  (compatible; msie 6.0; windows nt 5.1)";                 hr. method =  "GET";                 hr. Timeout = 30 * 60 * 1000;                 webresponse hs = hr. GetResponse ();                 Stream sr = hs. GetResponseStream ();                 streamreader ser = new streamreader (Sr, encoding.default);                 strret = ser. ReadToEnd ();            }             catch  (Exception ex)              {                 strret = null;                 messagebox.show (ex. Message);            }             return strRet;         }                       /// <summary>        ///   Send SMS         /// </summary>         /// <param name= "Sender" ></param>         /// <param name= "E" ></param>         private void btn_send_click (object sender, eventargs e)          {            if  (Txt_ Username. Text.tostring (). Trim ()  !=  ""  && textbox4.text.tostring (). Trim ()  !=  " && textbox2.text.tostring ()  != null)              {                 url = url + struid + txt_username. Text + strkey + txt_key. text + strmob + textbox4.text + strcontent + textbox2.text;                 string result  = gethtmlfromurl (URL);                 messagebox.show (Result);            &nBSP;}             else             {                 messagebox.show ("Please fill in complete, do not empty!") ");            }         }

The above process of sending SMS is used by the API provided by China Network. Refer to the following:

China network construction, SMS mass platform

C # Mass SMS