HTTP Send SMS API using C#

 In sample code

HTTP Send SMS API using C#

//Your authentication key
string authKey = "YourAuthKey";
//Multiple mobiles numbers separated by comma
string mobileNumber = "9999999";
//Sender ID,While using route4 sender id should be 6 characters long.
string senderId = "102234";
//Your message to send, Add URL encoding here.
string message = HttpUtility.UrlEncode("Test message");

//Prepare you post parameters
StringBuilder sbPostData = new StringBuilder();
sbPostData.AppendFormat("authkey={0}", authKey);
sbPostData.AppendFormat("&mobiles={0}", mobileNumber);
sbPostData.AppendFormat("&message={0}", message);
sbPostData.AppendFormat("&sender={0}", senderId);
sbPostData.AppendFormat("&route={0}", "default");

    //Call Send SMS API
    string sendSMSUri = "";
    //Create HTTPWebrequest
    HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(sendSMSUri);
    //Prepare and Add URL Encoded data
    UTF8Encoding encoding = new UTF8Encoding();
    byte[] data = encoding.GetBytes(sbPostData.ToString());
    //Specify post method
    httpWReq.Method = "POST";
    httpWReq.ContentType = "application/x-www-form-urlencoded";
    httpWReq.ContentLength = data.Length;
    using (Stream stream = httpWReq.GetRequestStream())
    	stream.Write(data, 0, data.Length);
    //Get the response
    HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();
    StreamReader reader = new StreamReader(response.GetResponseStream());
    string responseString = reader.ReadToEnd();

    //Close the response
catch (SystemException ex)
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