You could try something like this....C# Win32 application
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
SerialPort sp = new SerialPort();
sp.PortName = "COM10";
sp.BaudRate = 9600;
sp.Parity = Parity.None;
sp.DataBits = 8;
sp.StopBits = StopBits.One;
sp.Handshake = Handshake.XOnXOff;
sp.DtrEnable = true;
sp.RtsEnable = true;
sp.Open();
if (!sp.IsOpen)
{
MessageBox.Show("Serial port is not opened");
return;
}
sp.WriteLine("AT" + Environment.NewLine);
sp.WriteLine("ATD=\"" + "Destination Number;" + "\"" + Environment.NewLine);
}
}
}