How to send message in mobiles using C# console Application(By PC)

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C#

Hello,I want to send message by my number using C# console Application in other numbers. However i used following code.This is giving given Port not exist and The port is closed. What port i should use.
What requirement is needed. Actually i have to make .EXE file of this application.So that after entering message ,message should directly go to other number.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.Text.RegularExpressions;

namespace Message_port
{
    class Program
    {

        static void Main(string[] args)
        {
           
             SerialPort e = new SerialPort();
                e.PortName = "COM4";
                e.BaudRate = 230400;
                e.Parity = Parity.None;
                e.DataBits = 8;
                e.StopBits = StopBits.One;
                if (!(e.IsOpen))
                {
                    try
                    {
                        e.Open();
                    }
                    catch (Exception m)
                    {

                        Console.WriteLine(m.Message);
                    }
                }
              //  ExecCommand("AT", 300, "No phone connected at " + ".");
                    e.Write("AT" + (char)13);

                    e.Write("AT+CPIN?" + (char)13);

                    e.Write("AT+CREG?" + (char)13);

                    e.Write("AT+CMGF=1" + (char)13);
                    e.WriteLine("AT+CSCA=" + "9760783135" + (char)13);
                    e.WriteLine("AT+CMGS=" + "9971335835" + (char)13);
                    e.WriteLine("message" + (char)13);

                    e.Write(""+(char)26);

        }
    }
}