How can i send and receive sms from windows application without using any third party API?

Hi Faisal Z,

The C# implementation of the code is as follows:

using System;
using System.Threading;
using System.ComponentModel;
using System.IO.Ports;   

public class SMSCOMMS
{
    private SerialPort SMSPort;
    private Thread SMSThread;
    private Thread ReadThread;
    public static bool _Continue = false;
    public static bool _ContSMS = false;
    private bool _Wait = false;
    public static bool _ReadPort = false;
    public delegate void SendingEventHandler(bool Done);
    public event SendingEventHandler Sending;
    public delegate void DataReceivedEventHandler(string Message);
    public event DataReceivedEventHandler DataReceived;    

    public SMSCOMMS(ref string COMMPORT)
    {
        SMSPort = new SerialPort();
        SMSPort.PortName = COMMPORT;
        SMSPort.BaudRate = 9600;
        SMSPort.Parity = Parity.None;
        SMSPort.DataBits = 8;
        SMSPort.StopBits = StopBits.One;
        SMSPort.Handshake = Handshake.RequestToSend;
        SMSPort.DtrEnable = true;
        SMSPort.RtsEnable = true;
        SMSPort.NewLine = System.Environment.NewLine;
        ReadThread = new Thread(
            new System.Threading.ThreadStart(ReadPort));
    }    

    public bool SendSMS(string CellNumber, string SMSMessage)
    {
        string MyMessage = null;
        //Check if Message Length <= 160
        if (SMSMessage.Length <= 160)
            MyMessage = SMSMessage;
        else
            MyMessage = SMSMessage.Substring(0, 160);
        if (IsOpen == true)
        {
            SMSPort.WriteLine("AT+CMGS=" + CellNumber + "r");
            _ContSMS = false;
                SMSPort.WriteLine(
                MyMessage + System.Environment.NewLine + (char)(26));
              _Continue = false;
            if (Sending != null)
                Sending(false);
        }
        return false;
    }    

    private void ReadPort()
    {
        string SerialIn = null;
        byte[] RXBuffer = new byte[SMSPort.ReadBufferSize + 1];
        string SMSMessage = null;
        int Strpos = 0;
        string TmpStr = null;
        while (SMSPort.IsOpen == true)
        {
            if ((SMSPort.BytesToRead != 0) & (SMSPort.IsOpen == true))
            {
                while (SMSPort.BytesToRead != 0)
                {
                    SMSPort.Read(RXBuffer, 0, SMSPort.ReadBufferSize);
                    SerialIn = 
                        SerialIn + System.Text.Encoding.ASCII.GetString(
                        RXBuffer);
                            if (SerialIn.Contains(">") == true)
                    {
                        _ContSMS = true;
                    }
                    if (SerialIn.Contains("+CMGS:") == true)
                    {
                        _Continue = true;
                        if (Sending != null)
                            Sending(true);
                        _Wait = false;
                        SerialIn = string.Empty;
                        RXBuffer = new byte[SMSPort.ReadBufferSize + 1];
                    }
                }
                if (DataReceived != null)
                    DataReceived(SerialIn);
                SerialIn = string.Empty;
                RXBuffer = new byte[SMSPort.ReadBufferSize + 1];
            }
        }
    }    

    public bool SendSMS(string CellNumber, string SMSMessage)
    {
        string MyMessage = null;
        if (SMSMessage.Length <= 160)
        {
            MyMessage = SMSMessage;
        }
        else
        {
            MyMessage = SMSMessage.Substring(0, 160);
        }
        if (IsOpen == true)
        {
            SMSPort.WriteLine("AT+CMGS=" + CellNumber + "r");
            _ContSMS = false;
                SMSPort.WriteLine(
                    MyMessage + System.Environment.NewLine + (char)(26));
              _Continue = false;
            if (Sending != null)
                Sending(false);
        }
        return false;
    }    

    public void Open()
    {
        if (IsOpen == false)
        {
            SMSPort.Open();
                ReadThread.Start();
        }
    }    

    public void Close()
    {
        if (IsOpen == true)
        {
            SMSPort.Close();
        }
    }    

}

Then use the code as below:

SMSEngine = new SMSCOMMS("COM1");
SMSEngine.Open();
SMSEngine.SendSMS("919888888888","THIS IS YOUR MESSAGE");
SMSEngine.Close();

For more information about this sample code, see:http://www.codeproject.com/Articles/19023/Sending-SMS-using-NET

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