SMS API Integration Using C#

Introduction

In this blog, we are going to discuss how to send SMS using third party APIs.

Step 1

First we need to create an account. Please click on the below link and complete your registration process.

Registration Link

Step 2

After login, we need to create API key. Please check the below figure.

Step 3

Let's discuss about API.

We need to consume the below API with proper query parameters.

The API URL is,

https://api.msg91.com/api/sendhttp.php?mobiles=Mobile no.&authkey=$authentication_key&route=4&sender=TESTIN&message=Hello! This is a test message&country=91

Query parameters are:

mobiles - In this parameter, we need to pass mobile number.
authkey - In this parameter, we need to pass the API key.
route - This parameter differentiates the SMS type such as transactional or promotional
sender - Receiver will see this as sender id.
message - In this parameter, we need to pass the actual message.

By using the below code we can send SMS to the respective mobile number.

Code Snippet

public static string SendSMS(string MobileNumber, string Message)
{
//Your authentication key
string authKey = "";
//Multiple mobiles numbers separated by comma
string mobileNumber = MobileNumber;
//Sender ID,While using route4 sender id should be 6 characters long.
string senderId = "TESTIN";
//Your message to send, Add URL encoding here.
string message = HttpUtility.UrlEncode(Message);
string route = "4";
//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}", route);
//Call Send SMS API
string sendSMSUri = "https://control.msg91.com/api/sendhttp.php";
//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
reader.Close();
response.Close();
return responseString;
}

Summary

In this blog, we learned how to send SMS directly using a C# application by integrating MSG91 SMS API.

I hope you found it useful. Eat-> Code->Sleep->Repeat.

9 Comments

Join the conversation! Your thoughts help the community grow.

yuvaraj k3y ago
How to send regional languge wise SMS
Jaimin Shethiya6y ago
Nice one :)
- Madan Shekar6y ago
  Thank you Jaimin
SoNu7y ago
Informative , thanks :)
- Madan Shekar7y ago
  Thanks Sonu
Pankajkumar Patel7y ago
Nice article
- Madan Shekar7y ago
  Thanks pankaj Patel
Rajanikant Hawaldar7y ago
Informative blog Madan
- Madan Shekar7y ago
  Thank you Rajanikant Hawaldar