Sending sms using c#.NET

Submitted on: 1/5/2015 6:41:00 AM
By: ManuMehrotra (from psc cd)  
Level: Intermediate
User Rating: By 2 Users
Compatibility: C#
Views: 4444
     SMS is rapidly becoming a major medium of communication. In todays world we come across many examples of services which use SMS as a medium for communication like the polls in different news channels or exams results via SMS. Behind all these services there lies a software which automates the whole process of sending and recieving a SMS.This article discusses a code of a similar software written in C#.NET that sends a sms via a cell phone connected to the COM port. This software makes use of AT commands to send instructions to the cell phone from the computer and requires no third party dll's.

				The code given below sends AT commands to a mobile phone connected to the computer via the COM port and sends a SMS message to the number specified by the user. 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.IO.Ports; 
using System.Threading; 
namespace ConsoleApplication1 
class Program 
static AutoResetEvent readNow = new AutoResetEvent(false); 
static SerialPort port; 
static void Main(string[] args) 
Console.Write("Enter the port name your phone is connected to: "); 
string portname = Console.ReadLine(); 
port = EstablishConnection(portname); 
string recievedData = ExecuteCommand("AT", 300); 
recievedData = ExecuteCommand("AT+CMGF=1", 300); 
Console.Write("Enter the phone number you want to send message to: "); 
String phoneNumber = Console.ReadLine(); 
String command = "AT+CMGS=\"" + phoneNumber + "\""; 
Console.Write("Enter the message you want to send: "); 
recievedData = ExecuteCommand(command, 300); 
string message = Console.ReadLine(); 
command = message + char.ConvertFromUtf32(26) + "\r"; 
recievedData = ExecuteCommand(command, 300); 
if (recievedData.EndsWith("\r\nOK\r\n")) 
recievedData = "Message sent successfully"; 
if (recievedData.Contains("ERROR")) 
string recievedError = recievedData; 
recievedError = recievedError.Trim(); 
recievedData = "Following error occured while sending the message" + recievedError; 
catch (Exception e) 
Console.WriteLine("Error Message: "+e.Message.Trim()+"\r\nHit any key to Exit"); 
if (port != null) 
port.DataReceived -= new SerialDataReceivedEventHandler(DataReceived); 
port = null; 
static string ExecuteCommand(string command,int timeout) 
string recieved = receive(timeout); 
return recieved; 
static string receive(int timeout) 
string buffer = string.Empty; 
if (readNow.WaitOne(timeout, false)) 
string t = port.ReadExisting(); 
buffer += t; 
while (!buffer.EndsWith("\r\nOK\r\n") && !buffer.EndsWith("\r\n> ") && !buffer.Contains("ERROR")); 
return buffer; 
static SerialPort EstablishConnection(string portName) 
SerialPort port = new SerialPort(); 
port.PortName = portName; 
port.BaudRate = 19200; 
port.DataBits = 8; 
port.StopBits = StopBits.One; 
port.Parity = Parity.None; 
port.ReadTimeout = 300; 
port.WriteTimeout = 300; 
port.Encoding = Encoding.GetEncoding("iso-8859-1"); 
port.DataReceived += new SerialDataReceivedEventHandler(DataReceived); 
port.DtrEnable = true; 
port.RtsEnable = true; 
return port; 
static void DataReceived(object sender, SerialDataReceivedEventArgs e) 
if (e.EventType == SerialData.Chars) 

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